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Finding the Fourth Proportional to 87,998.40, 131,920.80 and 78,667.20

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Solution

The fourth proportional to 87,998.40, 131,920.80 and 78,667.20 is: 117,932.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,998.40 : 131,920.80 = 78,667.20 : x
  2. Step 2: Convert to fraction form
    87,998.40/131,920.80 = 78,667.20/x
  3. Step 3: Cross multiply
    87,998.40x = 131,920.80 × 78,667.20
  4. Step 4: Simplify right side
    87,998.40x = 10,377,839,957.76
  5. Step 5: Solve for x
    x = 10,377,839,957.76/87,998.40
  6. Step 6: Final answer
    x = 117,932.14

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1.5x scale

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.