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Finding the Fourth Proportional to 154.38, 231.06 and 99.58

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Solution

The fourth proportional to 154.38, 231.06 and 99.58 is: 149.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.38 : 231.06 = 99.58 : x
  2. Step 2: Convert to fraction form
    154.38/231.06 = 99.58/x
  3. Step 3: Cross multiply
    154.38x = 231.06 × 99.58
  4. Step 4: Simplify right side
    154.38x = 23,008.95
  5. Step 5: Solve for x
    x = 23,008.95/154.38
  6. Step 6: Final answer
    x = 149.04

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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.