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Finding the Fourth Proportional to 667.59, 921.96 and 447

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Solution

The fourth proportional to 667.59, 921.96 and 447 is: 617.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.59 : 921.96 = 447 : x
  2. Step 2: Convert to fraction form
    667.59/921.96 = 447/x
  3. Step 3: Cross multiply
    667.59x = 921.96 × 447
  4. Step 4: Simplify right side
    667.59x = 412,116.12
  5. Step 5: Solve for x
    x = 412,116.12/667.59
  6. Step 6: Final answer
    x = 617.32

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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.