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Finding the Fourth Proportional to 57.76, 86.20 and 50.15

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Solution

The fourth proportional to 57.76, 86.20 and 50.15 is: 74.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.76 : 86.20 = 50.15 : x
  2. Step 2: Convert to fraction form
    57.76/86.20 = 50.15/x
  3. Step 3: Cross multiply
    57.76x = 86.20 × 50.15
  4. Step 4: Simplify right side
    57.76x = 4,323.02
  5. Step 5: Solve for x
    x = 4,323.02/57.76
  6. Step 6: Final answer
    x = 74.85

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.