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Finding the Fourth Proportional to 138,719.80, 208,079.70 and 123,957.55

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Solution

The fourth proportional to 138,719.80, 208,079.70 and 123,957.55 is: 185,936.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,719.80 : 208,079.70 = 123,957.55 : x
  2. Step 2: Convert to fraction form
    138,719.80/208,079.70 = 123,957.55/x
  3. Step 3: Cross multiply
    138,719.80x = 208,079.70 × 123,957.55
  4. Step 4: Simplify right side
    138,719.80x = 25,793,049,816.74
  5. Step 5: Solve for x
    x = 25,793,049,816.74/138,719.80
  6. Step 6: Final answer
    x = 185,936.33

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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.