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Finding the Fourth Proportional to 154.80, 231.12 and 138.96

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Solution

The fourth proportional to 154.80, 231.12 and 138.96 is: 207.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.80 : 231.12 = 138.96 : x
  2. Step 2: Convert to fraction form
    154.80/231.12 = 138.96/x
  3. Step 3: Cross multiply
    154.80x = 231.12 × 138.96
  4. Step 4: Simplify right side
    154.80x = 32,116.44
  5. Step 5: Solve for x
    x = 32,116.44/154.80
  6. Step 6: Final answer
    x = 207.47

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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.