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Finding the Fourth Proportional to 80.64, 110.52 and 79.22

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Solution

The fourth proportional to 80.64, 110.52 and 79.22 is: 108.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.64 : 110.52 = 79.22 : x
  2. Step 2: Convert to fraction form
    80.64/110.52 = 79.22/x
  3. Step 3: Cross multiply
    80.64x = 110.52 × 79.22
  4. Step 4: Simplify right side
    80.64x = 8,755.67
  5. Step 5: Solve for x
    x = 8,755.67/80.64
  6. Step 6: Final answer
    x = 108.58

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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.