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Finding the Fourth Proportional to 138,406.02, 207,609.15 and 99,040.02

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Solution

The fourth proportional to 138,406.02, 207,609.15 and 99,040.02 is: 148,560.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,406.02 : 207,609.15 = 99,040.02 : x
  2. Step 2: Convert to fraction form
    138,406.02/207,609.15 = 99,040.02/x
  3. Step 3: Cross multiply
    138,406.02x = 207,609.15 × 99,040.02
  4. Step 4: Simplify right side
    138,406.02x = 20,561,614,368.18
  5. Step 5: Solve for x
    x = 20,561,614,368.18/138,406.02
  6. Step 6: Final answer
    x = 148,560.12

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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.