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Finding the Fourth Proportional to 108.38, 162.74 and 87.90

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Solution

The fourth proportional to 108.38, 162.74 and 87.90 is: 131.98

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.38 : 162.74 = 87.90 : x
  2. Step 2: Convert to fraction form
    108.38/162.74 = 87.90/x
  3. Step 3: Cross multiply
    108.38x = 162.74 × 87.90
  4. Step 4: Simplify right side
    108.38x = 14,304.46
  5. Step 5: Solve for x
    x = 14,304.46/108.38
  6. Step 6: Final answer
    x = 131.98

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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.