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Finding the Fourth Proportional to 138,435.55, 207,489.30 and 124,329.40

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Solution

The fourth proportional to 138,435.55, 207,489.30 and 124,329.40 is: 186,346.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,435.55 : 207,489.30 = 124,329.40 : x
  2. Step 2: Convert to fraction form
    138,435.55/207,489.30 = 124,329.40/x
  3. Step 3: Cross multiply
    138,435.55x = 207,489.30 × 124,329.40
  4. Step 4: Simplify right side
    138,435.55x = 25,797,020,175.42
  5. Step 5: Solve for x
    x = 25,797,020,175.42/138,435.55
  6. Step 6: Final answer
    x = 186,346.79

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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.