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Finding the Fourth Proportional to 129,201.71, 178,276.68 and 71,839.40

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Solution

The fourth proportional to 129,201.71, 178,276.68 and 71,839.40 is: 99,126.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,201.71 : 178,276.68 = 71,839.40 : x
  2. Step 2: Convert to fraction form
    129,201.71/178,276.68 = 71,839.40/x
  3. Step 3: Cross multiply
    129,201.71x = 178,276.68 × 71,839.40
  4. Step 4: Simplify right side
    129,201.71x = 12,807,288,833.81
  5. Step 5: Solve for x
    x = 12,807,288,833.81/129,201.71
  6. Step 6: Final answer
    x = 99,126.31

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1.5x scale

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.