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Finding the Fourth Proportional to 252.72, 379.12 and 115.78

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Solution

The fourth proportional to 252.72, 379.12 and 115.78 is: 173.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.72 : 379.12 = 115.78 : x
  2. Step 2: Convert to fraction form
    252.72/379.12 = 115.78/x
  3. Step 3: Cross multiply
    252.72x = 379.12 × 115.78
  4. Step 4: Simplify right side
    252.72x = 43,894.51
  5. Step 5: Solve for x
    x = 43,894.51/252.72
  6. Step 6: Final answer
    x = 173.69

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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.