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Finding the Fourth Proportional to 439.56, 606.64 and 328.85

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Solution

The fourth proportional to 439.56, 606.64 and 328.85 is: 453.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    439.56 : 606.64 = 328.85 : x
  2. Step 2: Convert to fraction form
    439.56/606.64 = 328.85/x
  3. Step 3: Cross multiply
    439.56x = 606.64 × 328.85
  4. Step 4: Simplify right side
    439.56x = 199,493.56
  5. Step 5: Solve for x
    x = 199,493.56/439.56
  6. Step 6: Final answer
    x = 453.85

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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.