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Finding the Fourth Proportional to 118.40, 163.34 and 79.58

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Solution

The fourth proportional to 118.40, 163.34 and 79.58 is: 109.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.40 : 163.34 = 79.58 : x
  2. Step 2: Convert to fraction form
    118.40/163.34 = 79.58/x
  3. Step 3: Cross multiply
    118.40x = 163.34 × 79.58
  4. Step 4: Simplify right side
    118.40x = 12,998.60
  5. Step 5: Solve for x
    x = 12,998.60/118.40
  6. Step 6: Final answer
    x = 109.79

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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.