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Finding the Fourth Proportional to 57.49, 86.21 and 28.58

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Solution

The fourth proportional to 57.49, 86.21 and 28.58 is: 42.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    57.49 : 86.21 = 28.58 : x
  2. Step 2: Convert to fraction form
    57.49/86.21 = 28.58/x
  3. Step 3: Cross multiply
    57.49x = 86.21 × 28.58
  4. Step 4: Simplify right side
    57.49x = 2,463.88
  5. Step 5: Solve for x
    x = 2,463.88/57.49
  6. Step 6: Final answer
    x = 42.86

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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.