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Finding the Fourth Proportional to 57.50, 86.24 and 21.42

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Solution

The fourth proportional to 57.50, 86.24 and 21.42 is: 32.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.50 : 86.24 = 21.42 : x
  2. Step 2: Convert to fraction form
    57.50/86.24 = 21.42/x
  3. Step 3: Cross multiply
    57.50x = 86.24 × 21.42
  4. Step 4: Simplify right side
    57.50x = 1,847.64
  5. Step 5: Solve for x
    x = 1,847.64/57.50
  6. Step 6: Final answer
    x = 32.13

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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.