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Finding the Fourth Proportional to 154.38, 213.06 and 99.18

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Solution

The fourth proportional to 154.38, 213.06 and 99.18 is: 136.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.38 : 213.06 = 99.18 : x
  2. Step 2: Convert to fraction form
    154.38/213.06 = 99.18/x
  3. Step 3: Cross multiply
    154.38x = 213.06 × 99.18
  4. Step 4: Simplify right side
    154.38x = 21,131.29
  5. Step 5: Solve for x
    x = 21,131.29/154.38
  6. Step 6: Final answer
    x = 136.88

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.