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Finding the Fourth Proportional to 75.96, 113.92 and 21.84

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Solution

The fourth proportional to 75.96, 113.92 and 21.84 is: 32.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    75.96 : 113.92 = 21.84 : x
  2. Step 2: Convert to fraction form
    75.96/113.92 = 21.84/x
  3. Step 3: Cross multiply
    75.96x = 113.92 × 21.84
  4. Step 4: Simplify right side
    75.96x = 2,487.90
  5. Step 5: Solve for x
    x = 2,487.90/75.96
  6. Step 6: Final answer
    x = 32.75

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.