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Finding the Fourth Proportional to 138,862.92, 208,304.08 and 68,723.40

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Solution

The fourth proportional to 138,862.92, 208,304.08 and 68,723.40 is: 103,089.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,862.92 : 208,304.08 = 68,723.40 : x
  2. Step 2: Convert to fraction form
    138,862.92/208,304.08 = 68,723.40/x
  3. Step 3: Cross multiply
    138,862.92x = 208,304.08 × 68,723.40
  4. Step 4: Simplify right side
    138,862.92x = 14,315,364,611.47
  5. Step 5: Solve for x
    x = 14,315,364,611.47/138,862.92
  6. Step 6: Final answer
    x = 103,089.90

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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.