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Finding the Fourth Proportional to 92.26, 126.98 and 90

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Solution

The fourth proportional to 92.26, 126.98 and 90 is: 123.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.26 : 126.98 = 90 : x
  2. Step 2: Convert to fraction form
    92.26/126.98 = 90/x
  3. Step 3: Cross multiply
    92.26x = 126.98 × 90
  4. Step 4: Simplify right side
    92.26x = 11,428.20
  5. Step 5: Solve for x
    x = 11,428.20/92.26
  6. Step 6: Final answer
    x = 123.87

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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.