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Finding the Fourth Proportional to 252.10, 378.17 and 115.21

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Solution

The fourth proportional to 252.10, 378.17 and 115.21 is: 172.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.10 : 378.17 = 115.21 : x
  2. Step 2: Convert to fraction form
    252.10/378.17 = 115.21/x
  3. Step 3: Cross multiply
    252.10x = 378.17 × 115.21
  4. Step 4: Simplify right side
    252.10x = 43,567.17
  5. Step 5: Solve for x
    x = 43,567.17/252.10
  6. Step 6: Final answer
    x = 172.82

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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.