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Finding the Fourth Proportional to 154.22, 231.38 and 99.41

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Solution

The fourth proportional to 154.22, 231.38 and 99.41 is: 149.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.22 : 231.38 = 99.41 : x
  2. Step 2: Convert to fraction form
    154.22/231.38 = 99.41/x
  3. Step 3: Cross multiply
    154.22x = 231.38 × 99.41
  4. Step 4: Simplify right side
    154.22x = 23,000.58
  5. Step 5: Solve for x
    x = 23,000.58/154.22
  6. Step 6: Final answer
    x = 149.14

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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.