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Finding the Fourth Proportional to 108.74, 162.84 and 72.71

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Solution

The fourth proportional to 108.74, 162.84 and 72.71 is: 108.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.74 : 162.84 = 72.71 : x
  2. Step 2: Convert to fraction form
    108.74/162.84 = 72.71/x
  3. Step 3: Cross multiply
    108.74x = 162.84 × 72.71
  4. Step 4: Simplify right side
    108.74x = 11,840.10
  5. Step 5: Solve for x
    x = 11,840.10/108.74
  6. Step 6: Final answer
    x = 108.88

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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.