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Finding the Fourth Proportional to 80.77, 111.45 and 45.79

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Solution

The fourth proportional to 80.77, 111.45 and 45.79 is: 63.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.77 : 111.45 = 45.79 : x
  2. Step 2: Convert to fraction form
    80.77/111.45 = 45.79/x
  3. Step 3: Cross multiply
    80.77x = 111.45 × 45.79
  4. Step 4: Simplify right side
    80.77x = 5,103.02
  5. Step 5: Solve for x
    x = 5,103.02/80.77
  6. Step 6: Final answer
    x = 63.18

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Find fourth proportional to 40.38, 55.73 and 22.89
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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.