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Finding the Fourth Proportional to 252.30, 378.18 and 142.66

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Solution

The fourth proportional to 252.30, 378.18 and 142.66 is: 213.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.30 : 378.18 = 142.66 : x
  2. Step 2: Convert to fraction form
    252.30/378.18 = 142.66/x
  3. Step 3: Cross multiply
    252.30x = 378.18 × 142.66
  4. Step 4: Simplify right side
    252.30x = 53,951.16
  5. Step 5: Solve for x
    x = 53,951.16/252.30
  6. Step 6: Final answer
    x = 213.84

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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.