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Finding the Fourth Proportional to 154.80, 213.72 and 99.54

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Solution

The fourth proportional to 154.80, 213.72 and 99.54 is: 137.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.80 : 213.72 = 99.54 : x
  2. Step 2: Convert to fraction form
    154.80/213.72 = 99.54/x
  3. Step 3: Cross multiply
    154.80x = 213.72 × 99.54
  4. Step 4: Simplify right side
    154.80x = 21,273.69
  5. Step 5: Solve for x
    x = 21,273.69/154.80
  6. Step 6: Final answer
    x = 137.43

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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.