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Finding the Fourth Proportional to 81.93, 113.19 and 74.89

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Solution

The fourth proportional to 81.93, 113.19 and 74.89 is: 103.46

Step by Step Solution

  1. Step 1: Write the proportion equation
    81.93 : 113.19 = 74.89 : x
  2. Step 2: Convert to fraction form
    81.93/113.19 = 74.89/x
  3. Step 3: Cross multiply
    81.93x = 113.19 × 74.89
  4. Step 4: Simplify right side
    81.93x = 8,476.42
  5. Step 5: Solve for x
    x = 8,476.42/81.93
  6. Step 6: Final answer
    x = 103.46

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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.