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Finding the Fourth Proportional to 667.28, 920.85 and 405.23

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Solution

The fourth proportional to 667.28, 920.85 and 405.23 is: 559.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.28 : 920.85 = 405.23 : x
  2. Step 2: Convert to fraction form
    667.28/920.85 = 405.23/x
  3. Step 3: Cross multiply
    667.28x = 920.85 × 405.23
  4. Step 4: Simplify right side
    667.28x = 373,156.05
  5. Step 5: Solve for x
    x = 373,156.05/667.28
  6. Step 6: Final answer
    x = 559.22

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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.