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Finding the Fourth Proportional to 118.64, 178.96 and 113.60

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Solution

The fourth proportional to 118.64, 178.96 and 113.60 is: 171.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.64 : 178.96 = 113.60 : x
  2. Step 2: Convert to fraction form
    118.64/178.96 = 113.60/x
  3. Step 3: Cross multiply
    118.64x = 178.96 × 113.60
  4. Step 4: Simplify right side
    118.64x = 20,329.86
  5. Step 5: Solve for x
    x = 20,329.86/118.64
  6. Step 6: Final answer
    x = 171.36

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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.