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Finding the Fourth Proportional to 118.78, 177.16 and 103.44

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Solution

The fourth proportional to 118.78, 177.16 and 103.44 is: 154.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.78 : 177.16 = 103.44 : x
  2. Step 2: Convert to fraction form
    118.78/177.16 = 103.44/x
  3. Step 3: Cross multiply
    118.78x = 177.16 × 103.44
  4. Step 4: Simplify right side
    118.78x = 18,325.43
  5. Step 5: Solve for x
    x = 18,325.43/118.78
  6. Step 6: Final answer
    x = 154.28

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.