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Finding the Fourth Proportional to 154.29, 212.72 and 121.03

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Solution

The fourth proportional to 154.29, 212.72 and 121.03 is: 166.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.29 : 212.72 = 121.03 : x
  2. Step 2: Convert to fraction form
    154.29/212.72 = 121.03/x
  3. Step 3: Cross multiply
    154.29x = 212.72 × 121.03
  4. Step 4: Simplify right side
    154.29x = 25,744.36
  5. Step 5: Solve for x
    x = 25,744.36/154.29
  6. Step 6: Final answer
    x = 166.86

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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.