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Finding the Fourth Proportional to 87.22, 131.34 and 64.56

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Solution

The fourth proportional to 87.22, 131.34 and 64.56 is: 97.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.22 : 131.34 = 64.56 : x
  2. Step 2: Convert to fraction form
    87.22/131.34 = 64.56/x
  3. Step 3: Cross multiply
    87.22x = 131.34 × 64.56
  4. Step 4: Simplify right side
    87.22x = 8,478.82
  5. Step 5: Solve for x
    x = 8,478.82/87.22
  6. Step 6: Final answer
    x = 97.21

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.