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Finding the Fourth Proportional to 667.94, 921.92 and 406.17

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Solution

The fourth proportional to 667.94, 921.92 and 406.17 is: 560.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.94 : 921.92 = 406.17 : x
  2. Step 2: Convert to fraction form
    667.94/921.92 = 406.17/x
  3. Step 3: Cross multiply
    667.94x = 921.92 × 406.17
  4. Step 4: Simplify right side
    667.94x = 374,454.22
  5. Step 5: Solve for x
    x = 374,454.22/667.94
  6. Step 6: Final answer
    x = 560.61

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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.