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Finding the Fourth Proportional to 439.65, 606.74 and 243.20

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Solution

The fourth proportional to 439.65, 606.74 and 243.20 is: 335.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.65 : 606.74 = 243.20 : x
  2. Step 2: Convert to fraction form
    439.65/606.74 = 243.20/x
  3. Step 3: Cross multiply
    439.65x = 606.74 × 243.20
  4. Step 4: Simplify right side
    439.65x = 147,559.47
  5. Step 5: Solve for x
    x = 147,559.47/439.65
  6. Step 6: Final answer
    x = 335.63

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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.