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Finding the Fourth Proportional to 252.64, 378.88 and 90.39

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Solution

The fourth proportional to 252.64, 378.88 and 90.39 is: 135.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.64 : 378.88 = 90.39 : x
  2. Step 2: Convert to fraction form
    252.64/378.88 = 90.39/x
  3. Step 3: Cross multiply
    252.64x = 378.88 × 90.39
  4. Step 4: Simplify right side
    252.64x = 34,246.96
  5. Step 5: Solve for x
    x = 34,246.96/252.64
  6. Step 6: Final answer
    x = 135.56

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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.