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Finding the Fourth Proportional to 154.90, 231.87 and 118.72

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Solution

The fourth proportional to 154.90, 231.87 and 118.72 is: 177.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.90 : 231.87 = 118.72 : x
  2. Step 2: Convert to fraction form
    154.90/231.87 = 118.72/x
  3. Step 3: Cross multiply
    154.90x = 231.87 × 118.72
  4. Step 4: Simplify right side
    154.90x = 27,527.61
  5. Step 5: Solve for x
    x = 27,527.61/154.90
  6. Step 6: Final answer
    x = 177.71

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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.