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Finding the Fourth Proportional to 667.22, 920.37 and 401.48

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Solution

The fourth proportional to 667.22, 920.37 and 401.48 is: 553.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.22 : 920.37 = 401.48 : x
  2. Step 2: Convert to fraction form
    667.22/920.37 = 401.48/x
  3. Step 3: Cross multiply
    667.22x = 920.37 × 401.48
  4. Step 4: Simplify right side
    667.22x = 369,505.55
  5. Step 5: Solve for x
    x = 369,505.55/667.22
  6. Step 6: Final answer
    x = 553.80

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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.