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Finding the Fourth Proportional to 57.32, 85.40 and 54.74

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Solution

The fourth proportional to 57.32, 85.40 and 54.74 is: 81.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.32 : 85.40 = 54.74 : x
  2. Step 2: Convert to fraction form
    57.32/85.40 = 54.74/x
  3. Step 3: Cross multiply
    57.32x = 85.40 × 54.74
  4. Step 4: Simplify right side
    57.32x = 4,674.80
  5. Step 5: Solve for x
    x = 4,674.80/57.32
  6. Step 6: Final answer
    x = 81.56

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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.