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Finding the Fourth Proportional to 57.76, 86.20 and 52.42

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Solution

The fourth proportional to 57.76, 86.20 and 52.42 is: 78.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.76 : 86.20 = 52.42 : x
  2. Step 2: Convert to fraction form
    57.76/86.20 = 52.42/x
  3. Step 3: Cross multiply
    57.76x = 86.20 × 52.42
  4. Step 4: Simplify right side
    57.76x = 4,518.60
  5. Step 5: Solve for x
    x = 4,518.60/57.76
  6. Step 6: Final answer
    x = 78.23

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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.