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Finding the Fourth Proportional to 91.18, 126.36 and 89.86

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Solution

The fourth proportional to 91.18, 126.36 and 89.86 is: 124.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    91.18 : 126.36 = 89.86 : x
  2. Step 2: Convert to fraction form
    91.18/126.36 = 89.86/x
  3. Step 3: Cross multiply
    91.18x = 126.36 × 89.86
  4. Step 4: Simplify right side
    91.18x = 11,354.71
  5. Step 5: Solve for x
    x = 11,354.71/91.18
  6. Step 6: Final answer
    x = 124.53

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Why These Related Problems?

These problems maintain the same ratio (1.39) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.