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Finding the Fourth Proportional to 154.71, 231.21 and 115.97

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Solution

The fourth proportional to 154.71, 231.21 and 115.97 is: 173.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.71 : 231.21 = 115.97 : x
  2. Step 2: Convert to fraction form
    154.71/231.21 = 115.97/x
  3. Step 3: Cross multiply
    154.71x = 231.21 × 115.97
  4. Step 4: Simplify right side
    154.71x = 26,812.27
  5. Step 5: Solve for x
    x = 26,812.27/154.71
  6. Step 6: Final answer
    x = 173.31

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.