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Finding the Fourth Proportional to 431,332.60, 646,998.90 and 131,812.60

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Solution

The fourth proportional to 431,332.60, 646,998.90 and 131,812.60 is: 197,718.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    431,332.60 : 646,998.90 = 131,812.60 : x
  2. Step 2: Convert to fraction form
    431,332.60/646,998.90 = 131,812.60/x
  3. Step 3: Cross multiply
    431,332.60x = 646,998.90 × 131,812.60
  4. Step 4: Simplify right side
    431,332.60x = 85,282,607,206.14
  5. Step 5: Solve for x
    x = 85,282,607,206.14/431,332.60
  6. Step 6: Final answer
    x = 197,718.90

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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.