Home / 815,276.98-1,217,425.56-665,813.98

Finding the Fourth Proportional to 815,276.98, 1,217,425.56 and 665,813.98

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Solution

The fourth proportional to 815,276.98, 1,217,425.56 and 665,813.98 is: 994,237.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    815,276.98 : 1,217,425.56 = 665,813.98 : x
  2. Step 2: Convert to fraction form
    815,276.98/1,217,425.56 = 665,813.98/x
  3. Step 3: Cross multiply
    815,276.98x = 1,217,425.56 × 665,813.98
  4. Step 4: Simplify right side
    815,276.98x = 810,578,951,370.20
  5. Step 5: Solve for x
    x = 810,578,951,370.20/815,276.98
  6. Step 6: Final answer
    x = 994,237.51

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Half scale
Find fourth proportional to 1,630,553.95, 2,434,851.12 and 1,331,627.95
Double scale
Find fourth proportional to 815,277.98, 1,217,427.05 and 665,814.98
Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.