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Finding the Fourth Proportional to 80.12, 110.40 and 72.32

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Solution

The fourth proportional to 80.12, 110.40 and 72.32 is: 99.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.12 : 110.40 = 72.32 : x
  2. Step 2: Convert to fraction form
    80.12/110.40 = 72.32/x
  3. Step 3: Cross multiply
    80.12x = 110.40 × 72.32
  4. Step 4: Simplify right side
    80.12x = 7,984.13
  5. Step 5: Solve for x
    x = 7,984.13/80.12
  6. Step 6: Final answer
    x = 99.65

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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.