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Finding the Fourth Proportional to 136,785.68, 205,194.88 and 129,320.72

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Solution

The fourth proportional to 136,785.68, 205,194.88 and 129,320.72 is: 193,996.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,785.68 : 205,194.88 = 129,320.72 : x
  2. Step 2: Convert to fraction form
    136,785.68/205,194.88 = 129,320.72/x
  3. Step 3: Cross multiply
    136,785.68x = 205,194.88 × 129,320.72
  4. Step 4: Simplify right side
    136,785.68x = 26,535,949,621.91
  5. Step 5: Solve for x
    x = 26,535,949,621.91/136,785.68
  6. Step 6: Final answer
    x = 193,996.55

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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.