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Finding the Fourth Proportional to 87.51, 131.22 and 36.15

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Solution

The fourth proportional to 87.51, 131.22 and 36.15 is: 54.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.51 : 131.22 = 36.15 : x
  2. Step 2: Convert to fraction form
    87.51/131.22 = 36.15/x
  3. Step 3: Cross multiply
    87.51x = 131.22 × 36.15
  4. Step 4: Simplify right side
    87.51x = 4,743.60
  5. Step 5: Solve for x
    x = 4,743.60/87.51
  6. Step 6: Final answer
    x = 54.21

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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.