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Finding the Fourth Proportional to 108.57, 162.92 and 57.21

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Solution

The fourth proportional to 108.57, 162.92 and 57.21 is: 85.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.57 : 162.92 = 57.21 : x
  2. Step 2: Convert to fraction form
    108.57/162.92 = 57.21/x
  3. Step 3: Cross multiply
    108.57x = 162.92 × 57.21
  4. Step 4: Simplify right side
    108.57x = 9,320.37
  5. Step 5: Solve for x
    x = 9,320.37/108.57
  6. Step 6: Final answer
    x = 85.85

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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.