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Finding the Fourth Proportional to 108.46, 162.82 and 91.30

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Solution

The fourth proportional to 108.46, 162.82 and 91.30 is: 137.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.46 : 162.82 = 91.30 : x
  2. Step 2: Convert to fraction form
    108.46/162.82 = 91.30/x
  3. Step 3: Cross multiply
    108.46x = 162.82 × 91.30
  4. Step 4: Simplify right side
    108.46x = 14,865.47
  5. Step 5: Solve for x
    x = 14,865.47/108.46
  6. Step 6: Final answer
    x = 137.06

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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.