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Finding the Fourth Proportional to 680,915.80, 939,663.78 and 394,491.24

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Solution

The fourth proportional to 680,915.80, 939,663.78 and 394,491.24 is: 544,397.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    680,915.80 : 939,663.78 = 394,491.24 : x
  2. Step 2: Convert to fraction form
    680,915.80/939,663.78 = 394,491.24/x
  3. Step 3: Cross multiply
    680,915.80x = 939,663.78 × 394,491.24
  4. Step 4: Simplify right side
    680,915.80x = 370,689,129,755.29
  5. Step 5: Solve for x
    x = 370,689,129,755.29/680,915.80
  6. Step 6: Final answer
    x = 544,397.90

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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.