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Finding the Fourth Proportional to 118.79, 163.87 and 79.49

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Solution

The fourth proportional to 118.79, 163.87 and 79.49 is: 109.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.79 : 163.87 = 79.49 : x
  2. Step 2: Convert to fraction form
    118.79/163.87 = 79.49/x
  3. Step 3: Cross multiply
    118.79x = 163.87 × 79.49
  4. Step 4: Simplify right side
    118.79x = 13,026.03
  5. Step 5: Solve for x
    x = 13,026.03/118.79
  6. Step 6: Final answer
    x = 109.66

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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.