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Finding the Fourth Proportional to 154.33, 231.51 and 120.31

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Solution

The fourth proportional to 154.33, 231.51 and 120.31 is: 180.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.33 : 231.51 = 120.31 : x
  2. Step 2: Convert to fraction form
    154.33/231.51 = 120.31/x
  3. Step 3: Cross multiply
    154.33x = 231.51 × 120.31
  4. Step 4: Simplify right side
    154.33x = 27,852.97
  5. Step 5: Solve for x
    x = 27,852.97/154.33
  6. Step 6: Final answer
    x = 180.48

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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.