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Finding the Fourth Proportional to 81.50, 111.80 and 74.66

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Solution

The fourth proportional to 81.50, 111.80 and 74.66 is: 102.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.50 : 111.80 = 74.66 : x
  2. Step 2: Convert to fraction form
    81.50/111.80 = 74.66/x
  3. Step 3: Cross multiply
    81.50x = 111.80 × 74.66
  4. Step 4: Simplify right side
    81.50x = 8,346.89
  5. Step 5: Solve for x
    x = 8,346.89/81.50
  6. Step 6: Final answer
    x = 102.42

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.