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Finding the Fourth Proportional to 252.68, 378.90 and 98.55

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Solution

The fourth proportional to 252.68, 378.90 and 98.55 is: 147.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.68 : 378.90 = 98.55 : x
  2. Step 2: Convert to fraction form
    252.68/378.90 = 98.55/x
  3. Step 3: Cross multiply
    252.68x = 378.90 × 98.55
  4. Step 4: Simplify right side
    252.68x = 37,340.60
  5. Step 5: Solve for x
    x = 37,340.60/252.68
  6. Step 6: Final answer
    x = 147.78

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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.