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Finding the Fourth Proportional to 399,230.74, 598,940.49 and 129,358.43

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Solution

The fourth proportional to 399,230.74, 598,940.49 and 129,358.43 is: 194,068.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,230.74 : 598,940.49 = 129,358.43 : x
  2. Step 2: Convert to fraction form
    399,230.74/598,940.49 = 129,358.43/x
  3. Step 3: Cross multiply
    399,230.74x = 598,940.49 × 129,358.43
  4. Step 4: Simplify right side
    399,230.74x = 77,478,001,449.83
  5. Step 5: Solve for x
    x = 77,478,001,449.83/399,230.74
  6. Step 6: Final answer
    x = 194,068.23

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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.