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Finding the Fourth Proportional to 57, 85.45 and 26.55

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Solution

The fourth proportional to 57, 85.45 and 26.55 is: 39.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    57 : 85.45 = 26.55 : x
  2. Step 2: Convert to fraction form
    57/85.45 = 26.55/x
  3. Step 3: Cross multiply
    57x = 85.45 × 26.55
  4. Step 4: Simplify right side
    57x = 2,268.70
  5. Step 5: Solve for x
    x = 2,268.70/57
  6. Step 6: Final answer
    x = 39.80

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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.