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Finding the Fourth Proportional to 57.27, 78.72 and 55.74

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Solution

The fourth proportional to 57.27, 78.72 and 55.74 is: 76.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.27 : 78.72 = 55.74 : x
  2. Step 2: Convert to fraction form
    57.27/78.72 = 55.74/x
  3. Step 3: Cross multiply
    57.27x = 78.72 × 55.74
  4. Step 4: Simplify right side
    57.27x = 4,387.85
  5. Step 5: Solve for x
    x = 4,387.85/57.27
  6. Step 6: Final answer
    x = 76.62

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.