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Finding the Fourth Proportional to 252.97, 379.45 and 90.65

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Solution

The fourth proportional to 252.97, 379.45 and 90.65 is: 135.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.97 : 379.45 = 90.65 : x
  2. Step 2: Convert to fraction form
    252.97/379.45 = 90.65/x
  3. Step 3: Cross multiply
    252.97x = 379.45 × 90.65
  4. Step 4: Simplify right side
    252.97x = 34,397.14
  5. Step 5: Solve for x
    x = 34,397.14/252.97
  6. Step 6: Final answer
    x = 135.97

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.