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Finding the Fourth Proportional to 92.20, 126.40 and 90.79

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Solution

The fourth proportional to 92.20, 126.40 and 90.79 is: 124.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.20 : 126.40 = 90.79 : x
  2. Step 2: Convert to fraction form
    92.20/126.40 = 90.79/x
  3. Step 3: Cross multiply
    92.20x = 126.40 × 90.79
  4. Step 4: Simplify right side
    92.20x = 11,475.86
  5. Step 5: Solve for x
    x = 11,475.86/92.20
  6. Step 6: Final answer
    x = 124.47

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These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.