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Finding the Fourth Proportional to 57.12, 85.49 and 49.20

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Solution

The fourth proportional to 57.12, 85.49 and 49.20 is: 73.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.12 : 85.49 = 49.20 : x
  2. Step 2: Convert to fraction form
    57.12/85.49 = 49.20/x
  3. Step 3: Cross multiply
    57.12x = 85.49 × 49.20
  4. Step 4: Simplify right side
    57.12x = 4,205.86
  5. Step 5: Solve for x
    x = 4,205.86/57.12
  6. Step 6: Final answer
    x = 73.63

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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.