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Finding the Fourth Proportional to 91.20, 126.74 and 90.26

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Solution

The fourth proportional to 91.20, 126.74 and 90.26 is: 125.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.20 : 126.74 = 90.26 : x
  2. Step 2: Convert to fraction form
    91.20/126.74 = 90.26/x
  3. Step 3: Cross multiply
    91.20x = 126.74 × 90.26
  4. Step 4: Simplify right side
    91.20x = 11,438.92
  5. Step 5: Solve for x
    x = 11,438.92/91.20
  6. Step 6: Final answer
    x = 125.43

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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.