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Finding the Fourth Proportional to 91.67, 126.51 and 90.73

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Solution

The fourth proportional to 91.67, 126.51 and 90.73 is: 125.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.67 : 126.51 = 90.73 : x
  2. Step 2: Convert to fraction form
    91.67/126.51 = 90.73/x
  3. Step 3: Cross multiply
    91.67x = 126.51 × 90.73
  4. Step 4: Simplify right side
    91.67x = 11,478.25
  5. Step 5: Solve for x
    x = 11,478.25/91.67
  6. Step 6: Final answer
    x = 125.21

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.