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Finding the Fourth Proportional to 154.40, 231.26 and 100.12

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Solution

The fourth proportional to 154.40, 231.26 and 100.12 is: 149.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.40 : 231.26 = 100.12 : x
  2. Step 2: Convert to fraction form
    154.40/231.26 = 100.12/x
  3. Step 3: Cross multiply
    154.40x = 231.26 × 100.12
  4. Step 4: Simplify right side
    154.40x = 23,153.75
  5. Step 5: Solve for x
    x = 23,153.75/154.40
  6. Step 6: Final answer
    x = 149.96

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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.