Home / 138,868.20-208,302.30-85,724.10

Finding the Fourth Proportional to 138,868.20, 208,302.30 and 85,724.10

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Solution

The fourth proportional to 138,868.20, 208,302.30 and 85,724.10 is: 128,586.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,868.20 : 208,302.30 = 85,724.10 : x
  2. Step 2: Convert to fraction form
    138,868.20/208,302.30 = 85,724.10/x
  3. Step 3: Cross multiply
    138,868.20x = 208,302.30 × 85,724.10
  4. Step 4: Simplify right side
    138,868.20x = 17,856,527,195.43
  5. Step 5: Solve for x
    x = 17,856,527,195.43/138,868.20
  6. Step 6: Final answer
    x = 128,586.15

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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.