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Finding the Fourth Proportional to 154.49, 231.68 and 67.80

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Solution

The fourth proportional to 154.49, 231.68 and 67.80 is: 101.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.49 : 231.68 = 67.80 : x
  2. Step 2: Convert to fraction form
    154.49/231.68 = 67.80/x
  3. Step 3: Cross multiply
    154.49x = 231.68 × 67.80
  4. Step 4: Simplify right side
    154.49x = 15,707.90
  5. Step 5: Solve for x
    x = 15,707.90/154.49
  6. Step 6: Final answer
    x = 101.68

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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.