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Finding the Fourth Proportional to 138,617.80, 207,926.70 and 128,120.20

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Solution

The fourth proportional to 138,617.80, 207,926.70 and 128,120.20 is: 192,180.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,617.80 : 207,926.70 = 128,120.20 : x
  2. Step 2: Convert to fraction form
    138,617.80/207,926.70 = 128,120.20/x
  3. Step 3: Cross multiply
    138,617.80x = 207,926.70 × 128,120.20
  4. Step 4: Simplify right side
    138,617.80x = 26,639,610,389.34
  5. Step 5: Solve for x
    x = 26,639,610,389.34/138,617.80
  6. Step 6: Final answer
    x = 192,180.30

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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.