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Finding the Fourth Proportional to 87,149.90, 120,376.48 and 71,891.74

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Solution

The fourth proportional to 87,149.90, 120,376.48 and 71,891.74 is: 99,301.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    87,149.90 : 120,376.48 = 71,891.74 : x
  2. Step 2: Convert to fraction form
    87,149.90/120,376.48 = 71,891.74/x
  3. Step 3: Cross multiply
    87,149.90x = 120,376.48 × 71,891.74
  4. Step 4: Simplify right side
    87,149.90x = 8,654,074,602.28
  5. Step 5: Solve for x
    x = 8,654,074,602.28/87,149.90
  6. Step 6: Final answer
    x = 99,301.03

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.