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Finding the Fourth Proportional to 439.79, 606.91 and 243.32

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Solution

The fourth proportional to 439.79, 606.91 and 243.32 is: 335.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.79 : 606.91 = 243.32 : x
  2. Step 2: Convert to fraction form
    439.79/606.91 = 243.32/x
  3. Step 3: Cross multiply
    439.79x = 606.91 × 243.32
  4. Step 4: Simplify right side
    439.79x = 147,669.70
  5. Step 5: Solve for x
    x = 147,669.70/439.79
  6. Step 6: Final answer
    x = 335.78

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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.