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Finding the Fourth Proportional to 118.42, 163.41 and 71.81

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Solution

The fourth proportional to 118.42, 163.41 and 71.81 is: 99.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    118.42 : 163.41 = 71.81 : x
  2. Step 2: Convert to fraction form
    118.42/163.41 = 71.81/x
  3. Step 3: Cross multiply
    118.42x = 163.41 × 71.81
  4. Step 4: Simplify right side
    118.42x = 11,733.52
  5. Step 5: Solve for x
    x = 11,733.52/118.42
  6. Step 6: Final answer
    x = 99.08

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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.