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Finding the Fourth Proportional to 877.82, 1,211.45 and 504.90

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Solution

The fourth proportional to 877.82, 1,211.45 and 504.90 is: 696.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    877.82 : 1,211.45 = 504.90 : x
  2. Step 2: Convert to fraction form
    877.82/1,211.45 = 504.90/x
  3. Step 3: Cross multiply
    877.82x = 1,211.45 × 504.90
  4. Step 4: Simplify right side
    877.82x = 611,658.58
  5. Step 5: Solve for x
    x = 611,658.58/877.82
  6. Step 6: Final answer
    x = 696.80

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.