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Finding the Fourth Proportional to 431,397.60, 647,039.70 and 131,908.20

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Solution

The fourth proportional to 431,397.60, 647,039.70 and 131,908.20 is: 197,844.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,397.60 : 647,039.70 = 131,908.20 : x
  2. Step 2: Convert to fraction form
    431,397.60/647,039.70 = 131,908.20/x
  3. Step 3: Cross multiply
    431,397.60x = 647,039.70 × 131,908.20
  4. Step 4: Simplify right side
    431,397.60x = 85,349,842,155.54
  5. Step 5: Solve for x
    x = 85,349,842,155.54/431,397.60
  6. Step 6: Final answer
    x = 197,844.96

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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.