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Finding the Fourth Proportional to 57.15, 85.56 and 38.79

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Solution

The fourth proportional to 57.15, 85.56 and 38.79 is: 58.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.15 : 85.56 = 38.79 : x
  2. Step 2: Convert to fraction form
    57.15/85.56 = 38.79/x
  3. Step 3: Cross multiply
    57.15x = 85.56 × 38.79
  4. Step 4: Simplify right side
    57.15x = 3,318.87
  5. Step 5: Solve for x
    x = 3,318.87/57.15
  6. Step 6: Final answer
    x = 58.07

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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.