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Finding the Fourth Proportional to 667.34, 921 and 405.36

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Solution

The fourth proportional to 667.34, 921 and 405.36 is: 559.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.34 : 921 = 405.36 : x
  2. Step 2: Convert to fraction form
    667.34/921 = 405.36/x
  3. Step 3: Cross multiply
    667.34x = 921 × 405.36
  4. Step 4: Simplify right side
    667.34x = 373,336.56
  5. Step 5: Solve for x
    x = 373,336.56/667.34
  6. Step 6: Final answer
    x = 559.44

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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.