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Finding the Fourth Proportional to 87.24, 120.48 and 76.28

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Solution

The fourth proportional to 87.24, 120.48 and 76.28 is: 105.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.24 : 120.48 = 76.28 : x
  2. Step 2: Convert to fraction form
    87.24/120.48 = 76.28/x
  3. Step 3: Cross multiply
    87.24x = 120.48 × 76.28
  4. Step 4: Simplify right side
    87.24x = 9,190.21
  5. Step 5: Solve for x
    x = 9,190.21/87.24
  6. Step 6: Final answer
    x = 105.34

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.