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Finding the Fourth Proportional to 87,641.80, 131,462.70 and 78,425.80

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Solution

The fourth proportional to 87,641.80, 131,462.70 and 78,425.80 is: 117,638.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,641.80 : 131,462.70 = 78,425.80 : x
  2. Step 2: Convert to fraction form
    87,641.80/131,462.70 = 78,425.80/x
  3. Step 3: Cross multiply
    87,641.80x = 131,462.70 × 78,425.80
  4. Step 4: Simplify right side
    87,641.80x = 10,310,067,417.66
  5. Step 5: Solve for x
    x = 10,310,067,417.66/87,641.80
  6. Step 6: Final answer
    x = 117,638.70

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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.