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Finding the Fourth Proportional to 87.96, 120.54 and 79.32

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Solution

The fourth proportional to 87.96, 120.54 and 79.32 is: 108.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    87.96 : 120.54 = 79.32 : x
  2. Step 2: Convert to fraction form
    87.96/120.54 = 79.32/x
  3. Step 3: Cross multiply
    87.96x = 120.54 × 79.32
  4. Step 4: Simplify right side
    87.96x = 9,561.23
  5. Step 5: Solve for x
    x = 9,561.23/87.96
  6. Step 6: Final answer
    x = 108.70

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.