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Finding the Fourth Proportional to 80.13, 110.49 and 61.65

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Solution

The fourth proportional to 80.13, 110.49 and 61.65 is: 85.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.13 : 110.49 = 61.65 : x
  2. Step 2: Convert to fraction form
    80.13/110.49 = 61.65/x
  3. Step 3: Cross multiply
    80.13x = 110.49 × 61.65
  4. Step 4: Simplify right side
    80.13x = 6,811.71
  5. Step 5: Solve for x
    x = 6,811.71/80.13
  6. Step 6: Final answer
    x = 85.01

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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.