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Finding the Fourth Proportional to 57.17, 78.83 and 38.73

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Solution

The fourth proportional to 57.17, 78.83 and 38.73 is: 53.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.17 : 78.83 = 38.73 : x
  2. Step 2: Convert to fraction form
    57.17/78.83 = 38.73/x
  3. Step 3: Cross multiply
    57.17x = 78.83 × 38.73
  4. Step 4: Simplify right side
    57.17x = 3,052.89
  5. Step 5: Solve for x
    x = 3,052.89/57.17
  6. Step 6: Final answer
    x = 53.40

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.