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Finding the Fourth Proportional to 158.11, 217.68 and 121.03

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Solution

The fourth proportional to 158.11, 217.68 and 121.03 is: 166.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    158.11 : 217.68 = 121.03 : x
  2. Step 2: Convert to fraction form
    158.11/217.68 = 121.03/x
  3. Step 3: Cross multiply
    158.11x = 217.68 × 121.03
  4. Step 4: Simplify right side
    158.11x = 26,345.81
  5. Step 5: Solve for x
    x = 26,345.81/158.11
  6. Step 6: Final answer
    x = 166.63

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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.