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Finding the Fourth Proportional to 252.63, 379.11 and 90.30

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Solution

The fourth proportional to 252.63, 379.11 and 90.30 is: 135.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.63 : 379.11 = 90.30 : x
  2. Step 2: Convert to fraction form
    252.63/379.11 = 90.30/x
  3. Step 3: Cross multiply
    252.63x = 379.11 × 90.30
  4. Step 4: Simplify right side
    252.63x = 34,233.63
  5. Step 5: Solve for x
    x = 34,233.63/252.63
  6. Step 6: Final answer
    x = 135.51

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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.