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Finding the Fourth Proportional to 90.88, 126.28 and 89.68

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Solution

The fourth proportional to 90.88, 126.28 and 89.68 is: 124.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.88 : 126.28 = 89.68 : x
  2. Step 2: Convert to fraction form
    90.88/126.28 = 89.68/x
  3. Step 3: Cross multiply
    90.88x = 126.28 × 89.68
  4. Step 4: Simplify right side
    90.88x = 11,324.79
  5. Step 5: Solve for x
    x = 11,324.79/90.88
  6. Step 6: Final answer
    x = 124.61

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.