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Finding the Fourth Proportional to 137,129.40, 206,039.70 and 87,233.40

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Solution

The fourth proportional to 137,129.40, 206,039.70 and 87,233.40 is: 131,069.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    137,129.40 : 206,039.70 = 87,233.40 : x
  2. Step 2: Convert to fraction form
    137,129.40/206,039.70 = 87,233.40/x
  3. Step 3: Cross multiply
    137,129.40x = 206,039.70 × 87,233.40
  4. Step 4: Simplify right side
    137,129.40x = 17,973,543,565.98
  5. Step 5: Solve for x
    x = 17,973,543,565.98/137,129.40
  6. Step 6: Final answer
    x = 131,069.95

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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.