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Finding the Fourth Proportional to 158.68, 218.34 and 121.83

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Solution

The fourth proportional to 158.68, 218.34 and 121.83 is: 167.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.68 : 218.34 = 121.83 : x
  2. Step 2: Convert to fraction form
    158.68/218.34 = 121.83/x
  3. Step 3: Cross multiply
    158.68x = 218.34 × 121.83
  4. Step 4: Simplify right side
    158.68x = 26,600.36
  5. Step 5: Solve for x
    x = 26,600.36/158.68
  6. Step 6: Final answer
    x = 167.64

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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.