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Finding the Fourth Proportional to 154.12, 231.34 and 89.19

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Solution

The fourth proportional to 154.12, 231.34 and 89.19 is: 133.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.12 : 231.34 = 89.19 : x
  2. Step 2: Convert to fraction form
    154.12/231.34 = 89.19/x
  3. Step 3: Cross multiply
    154.12x = 231.34 × 89.19
  4. Step 4: Simplify right side
    154.12x = 20,633.21
  5. Step 5: Solve for x
    x = 20,633.21/154.12
  6. Step 6: Final answer
    x = 133.88

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.