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Finding the Fourth Proportional to 80.16, 110.40 and 79.68

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Solution

The fourth proportional to 80.16, 110.40 and 79.68 is: 109.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.16 : 110.40 = 79.68 : x
  2. Step 2: Convert to fraction form
    80.16/110.40 = 79.68/x
  3. Step 3: Cross multiply
    80.16x = 110.40 × 79.68
  4. Step 4: Simplify right side
    80.16x = 8,796.67
  5. Step 5: Solve for x
    x = 8,796.67/80.16
  6. Step 6: Final answer
    x = 109.74

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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.