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Finding the Fourth Proportional to 667.88, 921.66 and 405.92

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Solution

The fourth proportional to 667.88, 921.66 and 405.92 is: 560.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.88 : 921.66 = 405.92 : x
  2. Step 2: Convert to fraction form
    667.88/921.66 = 405.92/x
  3. Step 3: Cross multiply
    667.88x = 921.66 × 405.92
  4. Step 4: Simplify right side
    667.88x = 374,120.23
  5. Step 5: Solve for x
    x = 374,120.23/667.88
  6. Step 6: Final answer
    x = 560.16

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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.