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Finding the Fourth Proportional to 231,007.90, 318,787.50 and 129,034.78

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Solution

The fourth proportional to 231,007.90, 318,787.50 and 129,034.78 is: 178,066.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    231,007.90 : 318,787.50 = 129,034.78 : x
  2. Step 2: Convert to fraction form
    231,007.90/318,787.50 = 129,034.78/x
  3. Step 3: Cross multiply
    231,007.90x = 318,787.50 × 129,034.78
  4. Step 4: Simplify right side
    231,007.90x = 41,134,674,929.25
  5. Step 5: Solve for x
    x = 41,134,674,929.25/231,007.90
  6. Step 6: Final answer
    x = 178,066.10

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.