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Finding the Fourth Proportional to 667.20, 920.90 and 443.17

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Solution

The fourth proportional to 667.20, 920.90 and 443.17 is: 611.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.20 : 920.90 = 443.17 : x
  2. Step 2: Convert to fraction form
    667.20/920.90 = 443.17/x
  3. Step 3: Cross multiply
    667.20x = 920.90 × 443.17
  4. Step 4: Simplify right side
    667.20x = 408,115.25
  5. Step 5: Solve for x
    x = 408,115.25/667.20
  6. Step 6: Final answer
    x = 611.68

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1.5x scale

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.