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Finding the Fourth Proportional to 398,962.88, 598,503.90 and 129,000.68

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Solution

The fourth proportional to 398,962.88, 598,503.90 and 129,000.68 is: 193,520.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,962.88 : 598,503.90 = 129,000.68 : x
  2. Step 2: Convert to fraction form
    398,962.88/598,503.90 = 129,000.68/x
  3. Step 3: Cross multiply
    398,962.88x = 598,503.90 × 129,000.68
  4. Step 4: Simplify right side
    398,962.88x = 77,207,410,082.65
  5. Step 5: Solve for x
    x = 77,207,410,082.65/398,962.88
  6. Step 6: Final answer
    x = 193,520.28

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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.