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Finding the Fourth Proportional to 57.08, 85.80 and 54.20

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Solution

The fourth proportional to 57.08, 85.80 and 54.20 is: 81.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.08 : 85.80 = 54.20 : x
  2. Step 2: Convert to fraction form
    57.08/85.80 = 54.20/x
  3. Step 3: Cross multiply
    57.08x = 85.80 × 54.20
  4. Step 4: Simplify right side
    57.08x = 4,650.36
  5. Step 5: Solve for x
    x = 4,650.36/57.08
  6. Step 6: Final answer
    x = 81.47

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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.