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Finding the Fourth Proportional to 118.23, 162.47 and 98.79

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Solution

The fourth proportional to 118.23, 162.47 and 98.79 is: 135.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.23 : 162.47 = 98.79 : x
  2. Step 2: Convert to fraction form
    118.23/162.47 = 98.79/x
  3. Step 3: Cross multiply
    118.23x = 162.47 × 98.79
  4. Step 4: Simplify right side
    118.23x = 16,049.92
  5. Step 5: Solve for x
    x = 16,049.92/118.23
  6. Step 6: Final answer
    x = 135.75

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Why These Related Problems?

These problems maintain the same ratio (1.37) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.