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Finding the Fourth Proportional to 242.11, 334.19 and 154.78

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Solution

The fourth proportional to 242.11, 334.19 and 154.78 is: 213.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    242.11 : 334.19 = 154.78 : x
  2. Step 2: Convert to fraction form
    242.11/334.19 = 154.78/x
  3. Step 3: Cross multiply
    242.11x = 334.19 × 154.78
  4. Step 4: Simplify right side
    242.11x = 51,726.15
  5. Step 5: Solve for x
    x = 51,726.15/242.11
  6. Step 6: Final answer
    x = 213.65

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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.