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Finding the Fourth Proportional to 138,610.80, 207,916.20 and 121,114.80

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Solution

The fourth proportional to 138,610.80, 207,916.20 and 121,114.80 is: 181,672.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,610.80 : 207,916.20 = 121,114.80 : x
  2. Step 2: Convert to fraction form
    138,610.80/207,916.20 = 121,114.80/x
  3. Step 3: Cross multiply
    138,610.80x = 207,916.20 × 121,114.80
  4. Step 4: Simplify right side
    138,610.80x = 25,181,728,979.76
  5. Step 5: Solve for x
    x = 25,181,728,979.76/138,610.80
  6. Step 6: Final answer
    x = 181,672.20

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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.