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Finding the Fourth Proportional to 154.29, 212.68 and 123.15

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Solution

The fourth proportional to 154.29, 212.68 and 123.15 is: 169.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.29 : 212.68 = 123.15 : x
  2. Step 2: Convert to fraction form
    154.29/212.68 = 123.15/x
  3. Step 3: Cross multiply
    154.29x = 212.68 × 123.15
  4. Step 4: Simplify right side
    154.29x = 26,191.80
  5. Step 5: Solve for x
    x = 26,191.80/154.29
  6. Step 6: Final answer
    x = 169.76

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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.