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Finding the Fourth Proportional to 87.60, 131.21 and 51.44

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Solution

The fourth proportional to 87.60, 131.21 and 51.44 is: 77.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.60 : 131.21 = 51.44 : x
  2. Step 2: Convert to fraction form
    87.60/131.21 = 51.44/x
  3. Step 3: Cross multiply
    87.60x = 131.21 × 51.44
  4. Step 4: Simplify right side
    87.60x = 6,749.24
  5. Step 5: Solve for x
    x = 6,749.24/87.60
  6. Step 6: Final answer
    x = 77.05

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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.