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Finding the Fourth Proportional to 118.62, 163.75 and 79.34

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Solution

The fourth proportional to 118.62, 163.75 and 79.34 is: 109.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.62 : 163.75 = 79.34 : x
  2. Step 2: Convert to fraction form
    118.62/163.75 = 79.34/x
  3. Step 3: Cross multiply
    118.62x = 163.75 × 79.34
  4. Step 4: Simplify right side
    118.62x = 12,991.93
  5. Step 5: Solve for x
    x = 12,991.93/118.62
  6. Step 6: Final answer
    x = 109.53

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.