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Finding the Fourth Proportional to 57.66, 85.96 and 54.78

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Solution

The fourth proportional to 57.66, 85.96 and 54.78 is: 81.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.66 : 85.96 = 54.78 : x
  2. Step 2: Convert to fraction form
    57.66/85.96 = 54.78/x
  3. Step 3: Cross multiply
    57.66x = 85.96 × 54.78
  4. Step 4: Simplify right side
    57.66x = 4,708.63
  5. Step 5: Solve for x
    x = 4,708.63/57.66
  6. Step 6: Final answer
    x = 81.66

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.