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Finding the Fourth Proportional to 418.08, 576.72 and 243.30

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Solution

The fourth proportional to 418.08, 576.72 and 243.30 is: 335.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    418.08 : 576.72 = 243.30 : x
  2. Step 2: Convert to fraction form
    418.08/576.72 = 243.30/x
  3. Step 3: Cross multiply
    418.08x = 576.72 × 243.30
  4. Step 4: Simplify right side
    418.08x = 140,315.98
  5. Step 5: Solve for x
    x = 140,315.98/418.08
  6. Step 6: Final answer
    x = 335.62

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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.