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Finding the Fourth Proportional to 439.64, 606.72 and 243.15

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Solution

The fourth proportional to 439.64, 606.72 and 243.15 is: 335.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.64 : 606.72 = 243.15 : x
  2. Step 2: Convert to fraction form
    439.64/606.72 = 243.15/x
  3. Step 3: Cross multiply
    439.64x = 606.72 × 243.15
  4. Step 4: Simplify right side
    439.64x = 147,523.97
  5. Step 5: Solve for x
    x = 147,523.97/439.64
  6. Step 6: Final answer
    x = 335.56

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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.