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Finding the Fourth Proportional to 80.50, 111.02 and 52.86

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Solution

The fourth proportional to 80.50, 111.02 and 52.86 is: 72.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    80.50 : 111.02 = 52.86 : x
  2. Step 2: Convert to fraction form
    80.50/111.02 = 52.86/x
  3. Step 3: Cross multiply
    80.50x = 111.02 × 52.86
  4. Step 4: Simplify right side
    80.50x = 5,868.52
  5. Step 5: Solve for x
    x = 5,868.52/80.50
  6. Step 6: Final answer
    x = 72.90

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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.