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Finding the Fourth Proportional to 438,562.40, 656,531.40 and 391,323.20

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Solution

The fourth proportional to 438,562.40, 656,531.40 and 391,323.20 is: 585,813.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    438,562.40 : 656,531.40 = 391,323.20 : x
  2. Step 2: Convert to fraction form
    438,562.40/656,531.40 = 391,323.20/x
  3. Step 3: Cross multiply
    438,562.40x = 656,531.40 × 391,323.20
  4. Step 4: Simplify right side
    438,562.40x = 256,915,968,348.48
  5. Step 5: Solve for x
    x = 256,915,968,348.48/438,562.40
  6. Step 6: Final answer
    x = 585,813.94

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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.