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Finding the Fourth Proportional to 92.57, 126.99 and 90.18

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Solution

The fourth proportional to 92.57, 126.99 and 90.18 is: 123.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.57 : 126.99 = 90.18 : x
  2. Step 2: Convert to fraction form
    92.57/126.99 = 90.18/x
  3. Step 3: Cross multiply
    92.57x = 126.99 × 90.18
  4. Step 4: Simplify right side
    92.57x = 11,451.96
  5. Step 5: Solve for x
    x = 11,451.96/92.57
  6. Step 6: Final answer
    x = 123.72

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Why These Related Problems?

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