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Finding the Fourth Proportional to 90.92, 124.92 and 86.89

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Solution

The fourth proportional to 90.92, 124.92 and 86.89 is: 119.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.92 : 124.92 = 86.89 : x
  2. Step 2: Convert to fraction form
    90.92/124.92 = 86.89/x
  3. Step 3: Cross multiply
    90.92x = 124.92 × 86.89
  4. Step 4: Simplify right side
    90.92x = 10,854.30
  5. Step 5: Solve for x
    x = 10,854.30/90.92
  6. Step 6: Final answer
    x = 119.39

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1.5x scale

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.