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Finding the Fourth Proportional to 90.96, 124.65 and 82.32

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Solution

The fourth proportional to 90.96, 124.65 and 82.32 is: 112.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    90.96 : 124.65 = 82.32 : x
  2. Step 2: Convert to fraction form
    90.96/124.65 = 82.32/x
  3. Step 3: Cross multiply
    90.96x = 124.65 × 82.32
  4. Step 4: Simplify right side
    90.96x = 10,261.19
  5. Step 5: Solve for x
    x = 10,261.19/90.96
  6. Step 6: Final answer
    x = 112.81

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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.