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Finding the Fourth Proportional to 252.42, 378.15 and 143.88

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Solution

The fourth proportional to 252.42, 378.15 and 143.88 is: 215.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.42 : 378.15 = 143.88 : x
  2. Step 2: Convert to fraction form
    252.42/378.15 = 143.88/x
  3. Step 3: Cross multiply
    252.42x = 378.15 × 143.88
  4. Step 4: Simplify right side
    252.42x = 54,408.22
  5. Step 5: Solve for x
    x = 54,408.22/252.42
  6. Step 6: Final answer
    x = 215.55

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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.