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Finding the Fourth Proportional to 439.46, 606.48 and 308.78

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Solution

The fourth proportional to 439.46, 606.48 and 308.78 is: 426.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.46 : 606.48 = 308.78 : x
  2. Step 2: Convert to fraction form
    439.46/606.48 = 308.78/x
  3. Step 3: Cross multiply
    439.46x = 606.48 × 308.78
  4. Step 4: Simplify right side
    439.46x = 187,268.89
  5. Step 5: Solve for x
    x = 187,268.89/439.46
  6. Step 6: Final answer
    x = 426.13

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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.