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Finding the Fourth Proportional to 399,228.74, 598,937.49 and 129,356.43

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Solution

The fourth proportional to 399,228.74, 598,937.49 and 129,356.43 is: 194,065.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    399,228.74 : 598,937.49 = 129,356.43 : x
  2. Step 2: Convert to fraction form
    399,228.74/598,937.49 = 129,356.43/x
  3. Step 3: Cross multiply
    399,228.74x = 598,937.49 × 129,356.43
  4. Step 4: Simplify right side
    399,228.74x = 77,476,413,253.55
  5. Step 5: Solve for x
    x = 77,476,413,253.55/399,228.74
  6. Step 6: Final answer
    x = 194,065.22

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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.