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Finding the Fourth Proportional to 154.96, 213.90 and 118.24

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Solution

The fourth proportional to 154.96, 213.90 and 118.24 is: 163.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    154.96 : 213.90 = 118.24 : x
  2. Step 2: Convert to fraction form
    154.96/213.90 = 118.24/x
  3. Step 3: Cross multiply
    154.96x = 213.90 × 118.24
  4. Step 4: Simplify right side
    154.96x = 25,291.54
  5. Step 5: Solve for x
    x = 25,291.54/154.96
  6. Step 6: Final answer
    x = 163.21

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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.