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Finding the Fourth Proportional to 57.64, 86.78 and 39.73

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Solution

The fourth proportional to 57.64, 86.78 and 39.73 is: 59.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.64 : 86.78 = 39.73 : x
  2. Step 2: Convert to fraction form
    57.64/86.78 = 39.73/x
  3. Step 3: Cross multiply
    57.64x = 86.78 × 39.73
  4. Step 4: Simplify right side
    57.64x = 3,447.14
  5. Step 5: Solve for x
    x = 3,447.14/57.64
  6. Step 6: Final answer
    x = 59.80

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.