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Finding the Fourth Proportional to 118.68, 178.20 and 103.32

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Solution

The fourth proportional to 118.68, 178.20 and 103.32 is: 155.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.68 : 178.20 = 103.32 : x
  2. Step 2: Convert to fraction form
    118.68/178.20 = 103.32/x
  3. Step 3: Cross multiply
    118.68x = 178.20 × 103.32
  4. Step 4: Simplify right side
    118.68x = 18,411.62
  5. Step 5: Solve for x
    x = 18,411.62/118.68
  6. Step 6: Final answer
    x = 155.14

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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.