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Finding the Fourth Proportional to 118.41, 178.31 and 103.37

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Solution

The fourth proportional to 118.41, 178.31 and 103.37 is: 155.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.41 : 178.31 = 103.37 : x
  2. Step 2: Convert to fraction form
    118.41/178.31 = 103.37/x
  3. Step 3: Cross multiply
    118.41x = 178.31 × 103.37
  4. Step 4: Simplify right side
    118.41x = 18,431.90
  5. Step 5: Solve for x
    x = 18,431.90/118.41
  6. Step 6: Final answer
    x = 155.66

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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.