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Finding the Fourth Proportional to 87,854.80, 131,790.29 and 28,690.78

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Solution

The fourth proportional to 87,854.80, 131,790.29 and 28,690.78 is: 43,038.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,854.80 : 131,790.29 = 28,690.78 : x
  2. Step 2: Convert to fraction form
    87,854.80/131,790.29 = 28,690.78/x
  3. Step 3: Cross multiply
    87,854.80x = 131,790.29 × 28,690.78
  4. Step 4: Simplify right side
    87,854.80x = 3,781,165,557.57
  5. Step 5: Solve for x
    x = 3,781,165,557.57/87,854.80
  6. Step 6: Final answer
    x = 43,038.81

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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.