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Finding the Fourth Proportional to 91.17, 125.82 and 90.23

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Solution

The fourth proportional to 91.17, 125.82 and 90.23 is: 124.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.17 : 125.82 = 90.23 : x
  2. Step 2: Convert to fraction form
    91.17/125.82 = 90.23/x
  3. Step 3: Cross multiply
    91.17x = 125.82 × 90.23
  4. Step 4: Simplify right side
    91.17x = 11,352.11
  5. Step 5: Solve for x
    x = 11,352.11/91.17
  6. Step 6: Final answer
    x = 124.52

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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.