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Finding the Fourth Proportional to 87,117.80, 130,676.70 and 81,212.90

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Solution

The fourth proportional to 87,117.80, 130,676.70 and 81,212.90 is: 121,819.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,117.80 : 130,676.70 = 81,212.90 : x
  2. Step 2: Convert to fraction form
    87,117.80/130,676.70 = 81,212.90/x
  3. Step 3: Cross multiply
    87,117.80x = 130,676.70 × 81,212.90
  4. Step 4: Simplify right side
    87,117.80x = 10,612,633,769.43
  5. Step 5: Solve for x
    x = 10,612,633,769.43/87,117.80
  6. Step 6: Final answer
    x = 121,819.35

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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.