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Finding the Fourth Proportional to 118.88, 178.24 and 113.12

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Solution

The fourth proportional to 118.88, 178.24 and 113.12 is: 169.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.88 : 178.24 = 113.12 : x
  2. Step 2: Convert to fraction form
    118.88/178.24 = 113.12/x
  3. Step 3: Cross multiply
    118.88x = 178.24 × 113.12
  4. Step 4: Simplify right side
    118.88x = 20,162.51
  5. Step 5: Solve for x
    x = 20,162.51/118.88
  6. Step 6: Final answer
    x = 169.60

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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.