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Finding the Fourth Proportional to 57.32, 85.96 and 18.80

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Solution

The fourth proportional to 57.32, 85.96 and 18.80 is: 28.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.32 : 85.96 = 18.80 : x
  2. Step 2: Convert to fraction form
    57.32/85.96 = 18.80/x
  3. Step 3: Cross multiply
    57.32x = 85.96 × 18.80
  4. Step 4: Simplify right side
    57.32x = 1,616.05
  5. Step 5: Solve for x
    x = 1,616.05/57.32
  6. Step 6: Final answer
    x = 28.19

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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.