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Finding the Fourth Proportional to 158.18, 217.96 and 118.76

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Solution

The fourth proportional to 158.18, 217.96 and 118.76 is: 163.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.18 : 217.96 = 118.76 : x
  2. Step 2: Convert to fraction form
    158.18/217.96 = 118.76/x
  3. Step 3: Cross multiply
    158.18x = 217.96 × 118.76
  4. Step 4: Simplify right side
    158.18x = 25,884.93
  5. Step 5: Solve for x
    x = 25,884.93/158.18
  6. Step 6: Final answer
    x = 163.64

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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.