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Finding the Fourth Proportional to 154.32, 231.69 and 89.39

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Solution

The fourth proportional to 154.32, 231.69 and 89.39 is: 134.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.32 : 231.69 = 89.39 : x
  2. Step 2: Convert to fraction form
    154.32/231.69 = 89.39/x
  3. Step 3: Cross multiply
    154.32x = 231.69 × 89.39
  4. Step 4: Simplify right side
    154.32x = 20,709.61
  5. Step 5: Solve for x
    x = 20,709.61/154.32
  6. Step 6: Final answer
    x = 134.20

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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.