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Finding the Fourth Proportional to 118.32, 163.40 and 109.84

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Solution

The fourth proportional to 118.32, 163.40 and 109.84 is: 151.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.32 : 163.40 = 109.84 : x
  2. Step 2: Convert to fraction form
    118.32/163.40 = 109.84/x
  3. Step 3: Cross multiply
    118.32x = 163.40 × 109.84
  4. Step 4: Simplify right side
    118.32x = 17,947.86
  5. Step 5: Solve for x
    x = 17,947.86/118.32
  6. Step 6: Final answer
    x = 151.69

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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.