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Finding the Fourth Proportional to 252.88, 379.39 and 90.68

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Solution

The fourth proportional to 252.88, 379.39 and 90.68 is: 136.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    252.88 : 379.39 = 90.68 : x
  2. Step 2: Convert to fraction form
    252.88/379.39 = 90.68/x
  3. Step 3: Cross multiply
    252.88x = 379.39 × 90.68
  4. Step 4: Simplify right side
    252.88x = 34,403.09
  5. Step 5: Solve for x
    x = 34,403.09/252.88
  6. Step 6: Final answer
    x = 136.05

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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.