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Finding the Fourth Proportional to 439.65, 606.56 and 308.43

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Solution

The fourth proportional to 439.65, 606.56 and 308.43 is: 425.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.65 : 606.56 = 308.43 : x
  2. Step 2: Convert to fraction form
    439.65/606.56 = 308.43/x
  3. Step 3: Cross multiply
    439.65x = 606.56 × 308.43
  4. Step 4: Simplify right side
    439.65x = 187,079.76
  5. Step 5: Solve for x
    x = 187,079.76/439.65
  6. Step 6: Final answer
    x = 425.52

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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.