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Finding the Fourth Proportional to 667.26, 920.96 and 401.92

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Solution

The fourth proportional to 667.26, 920.96 and 401.92 is: 554.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.26 : 920.96 = 401.92 : x
  2. Step 2: Convert to fraction form
    667.26/920.96 = 401.92/x
  3. Step 3: Cross multiply
    667.26x = 920.96 × 401.92
  4. Step 4: Simplify right side
    667.26x = 370,152.24
  5. Step 5: Solve for x
    x = 370,152.24/667.26
  6. Step 6: Final answer
    x = 554.73

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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.