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Finding the Fourth Proportional to 154.24, 231.20 and 68.64

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Solution

The fourth proportional to 154.24, 231.20 and 68.64 is: 102.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.24 : 231.20 = 68.64 : x
  2. Step 2: Convert to fraction form
    154.24/231.20 = 68.64/x
  3. Step 3: Cross multiply
    154.24x = 231.20 × 68.64
  4. Step 4: Simplify right side
    154.24x = 15,869.57
  5. Step 5: Solve for x
    x = 15,869.57/154.24
  6. Step 6: Final answer
    x = 102.89

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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.