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Finding the Fourth Proportional to 154.39, 231.67 and 61.90

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Solution

The fourth proportional to 154.39, 231.67 and 61.90 is: 92.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.39 : 231.67 = 61.90 : x
  2. Step 2: Convert to fraction form
    154.39/231.67 = 61.90/x
  3. Step 3: Cross multiply
    154.39x = 231.67 × 61.90
  4. Step 4: Simplify right side
    154.39x = 14,340.37
  5. Step 5: Solve for x
    x = 14,340.37/154.39
  6. Step 6: Final answer
    x = 92.88

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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.