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Finding the Fourth Proportional to 431,881.21, 647,939.52 and 132,355.15

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Solution

The fourth proportional to 431,881.21, 647,939.52 and 132,355.15 is: 198,568.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,881.21 : 647,939.52 = 132,355.15 : x
  2. Step 2: Convert to fraction form
    431,881.21/647,939.52 = 132,355.15/x
  3. Step 3: Cross multiply
    431,881.21x = 647,939.52 × 132,355.15
  4. Step 4: Simplify right side
    431,881.21x = 85,758,132,360.53
  5. Step 5: Solve for x
    x = 85,758,132,360.53/431,881.21
  6. Step 6: Final answer
    x = 198,568.80

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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.