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Finding the Fourth Proportional to 90.01, 124.32 and 81.91

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Solution

The fourth proportional to 90.01, 124.32 and 81.91 is: 113.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.01 : 124.32 = 81.91 : x
  2. Step 2: Convert to fraction form
    90.01/124.32 = 81.91/x
  3. Step 3: Cross multiply
    90.01x = 124.32 × 81.91
  4. Step 4: Simplify right side
    90.01x = 10,183.05
  5. Step 5: Solve for x
    x = 10,183.05/90.01
  6. Step 6: Final answer
    x = 113.13

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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.