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Finding the Fourth Proportional to 158.62, 218.74 and 121.70

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Solution

The fourth proportional to 158.62, 218.74 and 121.70 is: 167.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.62 : 218.74 = 121.70 : x
  2. Step 2: Convert to fraction form
    158.62/218.74 = 121.70/x
  3. Step 3: Cross multiply
    158.62x = 218.74 × 121.70
  4. Step 4: Simplify right side
    158.62x = 26,620.66
  5. Step 5: Solve for x
    x = 26,620.66/158.62
  6. Step 6: Final answer
    x = 167.83

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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.