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Finding the Fourth Proportional to 111.18, 167.60 and 103.74

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Solution

The fourth proportional to 111.18, 167.60 and 103.74 is: 156.39

Step by Step Solution

  1. Step 1: Write the proportion equation
    111.18 : 167.60 = 103.74 : x
  2. Step 2: Convert to fraction form
    111.18/167.60 = 103.74/x
  3. Step 3: Cross multiply
    111.18x = 167.60 × 103.74
  4. Step 4: Simplify right side
    111.18x = 17,387.58
  5. Step 5: Solve for x
    x = 17,387.58/111.18
  6. Step 6: Final answer
    x = 156.39

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Why These Related Problems?

These problems maintain the same ratio (1.51) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.