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Finding the Fourth Proportional to 418.14, 576.78 and 243.45

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Solution

The fourth proportional to 418.14, 576.78 and 243.45 is: 335.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.14 : 576.78 = 243.45 : x
  2. Step 2: Convert to fraction form
    418.14/576.78 = 243.45/x
  3. Step 3: Cross multiply
    418.14x = 576.78 × 243.45
  4. Step 4: Simplify right side
    418.14x = 140,417.09
  5. Step 5: Solve for x
    x = 140,417.09/418.14
  6. Step 6: Final answer
    x = 335.81

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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.