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Finding the Fourth Proportional to 92.15, 126.90 and 91.86

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Solution

The fourth proportional to 92.15, 126.90 and 91.86 is: 126.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    92.15 : 126.90 = 91.86 : x
  2. Step 2: Convert to fraction form
    92.15/126.90 = 91.86/x
  3. Step 3: Cross multiply
    92.15x = 126.90 × 91.86
  4. Step 4: Simplify right side
    92.15x = 11,657.85
  5. Step 5: Solve for x
    x = 11,657.85/92.15
  6. Step 6: Final answer
    x = 126.51

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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.