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Finding the Fourth Proportional to 392,691.36, 588,699.70 and 136,490.64

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Solution

The fourth proportional to 392,691.36, 588,699.70 and 136,490.64 is: 204,618.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    392,691.36 : 588,699.70 = 136,490.64 : x
  2. Step 2: Convert to fraction form
    392,691.36/588,699.70 = 136,490.64/x
  3. Step 3: Cross multiply
    392,691.36x = 588,699.70 × 136,490.64
  4. Step 4: Simplify right side
    392,691.36x = 80,351,998,820.81
  5. Step 5: Solve for x
    x = 80,351,998,820.81/392,691.36
  6. Step 6: Final answer
    x = 204,618.71

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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.