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Finding the Fourth Proportional to 87.57, 131.37 and 53.40

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Solution

The fourth proportional to 87.57, 131.37 and 53.40 is: 80.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.57 : 131.37 = 53.40 : x
  2. Step 2: Convert to fraction form
    87.57/131.37 = 53.40/x
  3. Step 3: Cross multiply
    87.57x = 131.37 × 53.40
  4. Step 4: Simplify right side
    87.57x = 7,015.16
  5. Step 5: Solve for x
    x = 7,015.16/87.57
  6. Step 6: Final answer
    x = 80.11

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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.