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Finding the Fourth Proportional to 57.77, 86.97 and 39.85

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Solution

The fourth proportional to 57.77, 86.97 and 39.85 is: 59.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.77 : 86.97 = 39.85 : x
  2. Step 2: Convert to fraction form
    57.77/86.97 = 39.85/x
  3. Step 3: Cross multiply
    57.77x = 86.97 × 39.85
  4. Step 4: Simplify right side
    57.77x = 3,465.54
  5. Step 5: Solve for x
    x = 3,465.54/57.77
  6. Step 6: Final answer
    x = 59.99

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.