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Finding the Fourth Proportional to 447.40, 667.22 and 438.76

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Solution

The fourth proportional to 447.40, 667.22 and 438.76 is: 654.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    447.40 : 667.22 = 438.76 : x
  2. Step 2: Convert to fraction form
    447.40/667.22 = 438.76/x
  3. Step 3: Cross multiply
    447.40x = 667.22 × 438.76
  4. Step 4: Simplify right side
    447.40x = 292,749.45
  5. Step 5: Solve for x
    x = 292,749.45/447.40
  6. Step 6: Final answer
    x = 654.33

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.