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Finding the Fourth Proportional to 87.43, 131.15 and 64.77

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Solution

The fourth proportional to 87.43, 131.15 and 64.77 is: 97.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.43 : 131.15 = 64.77 : x
  2. Step 2: Convert to fraction form
    87.43/131.15 = 64.77/x
  3. Step 3: Cross multiply
    87.43x = 131.15 × 64.77
  4. Step 4: Simplify right side
    87.43x = 8,494.75
  5. Step 5: Solve for x
    x = 8,494.75/87.43
  6. Step 6: Final answer
    x = 97.16

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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.