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Finding the Fourth Proportional to 57.26, 85.86 and 39.91

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Solution

The fourth proportional to 57.26, 85.86 and 39.91 is: 59.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.26 : 85.86 = 39.91 : x
  2. Step 2: Convert to fraction form
    57.26/85.86 = 39.91/x
  3. Step 3: Cross multiply
    57.26x = 85.86 × 39.91
  4. Step 4: Simplify right side
    57.26x = 3,426.67
  5. Step 5: Solve for x
    x = 3,426.67/57.26
  6. Step 6: Final answer
    x = 59.84

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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.