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Finding the Fourth Proportional to 91.24, 124.24 and 90.92

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Solution

The fourth proportional to 91.24, 124.24 and 90.92 is: 123.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.24 : 124.24 = 90.92 : x
  2. Step 2: Convert to fraction form
    91.24/124.24 = 90.92/x
  3. Step 3: Cross multiply
    91.24x = 124.24 × 90.92
  4. Step 4: Simplify right side
    91.24x = 11,295.90
  5. Step 5: Solve for x
    x = 11,295.90/91.24
  6. Step 6: Final answer
    x = 123.80

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Why These Related Problems?

These problems maintain the same ratio (1.36) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.