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Finding the Fourth Proportional to 138,612.80, 207,919.20 and 82,479.80

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Solution

The fourth proportional to 138,612.80, 207,919.20 and 82,479.80 is: 123,719.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,612.80 : 207,919.20 = 82,479.80 : x
  2. Step 2: Convert to fraction form
    138,612.80/207,919.20 = 82,479.80/x
  3. Step 3: Cross multiply
    138,612.80x = 207,919.20 × 82,479.80
  4. Step 4: Simplify right side
    138,612.80x = 17,149,134,032.16
  5. Step 5: Solve for x
    x = 17,149,134,032.16/138,612.80
  6. Step 6: Final answer
    x = 123,719.70

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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.