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Finding the Fourth Proportional to 85,675.20, 128,512.80 and 82,394.70

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Solution

The fourth proportional to 85,675.20, 128,512.80 and 82,394.70 is: 123,592.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,675.20 : 128,512.80 = 82,394.70 : x
  2. Step 2: Convert to fraction form
    85,675.20/128,512.80 = 82,394.70/x
  3. Step 3: Cross multiply
    85,675.20x = 128,512.80 × 82,394.70
  4. Step 4: Simplify right side
    85,675.20x = 10,588,773,602.16
  5. Step 5: Solve for x
    x = 10,588,773,602.16/85,675.20
  6. Step 6: Final answer
    x = 123,592.05

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.