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Finding the Fourth Proportional to 108.35, 162.45 and 67.78

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Solution

The fourth proportional to 108.35, 162.45 and 67.78 is: 101.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    108.35 : 162.45 = 67.78 : x
  2. Step 2: Convert to fraction form
    108.35/162.45 = 67.78/x
  3. Step 3: Cross multiply
    108.35x = 162.45 × 67.78
  4. Step 4: Simplify right side
    108.35x = 11,010.45
  5. Step 5: Solve for x
    x = 11,010.45/108.35
  6. Step 6: Final answer
    x = 101.62

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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.