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Finding the Fourth Proportional to 667.70, 920.96 and 443.38

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Solution

The fourth proportional to 667.70, 920.96 and 443.38 is: 611.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.70 : 920.96 = 443.38 : x
  2. Step 2: Convert to fraction form
    667.70/920.96 = 443.38/x
  3. Step 3: Cross multiply
    667.70x = 920.96 × 443.38
  4. Step 4: Simplify right side
    667.70x = 408,335.24
  5. Step 5: Solve for x
    x = 408,335.24/667.70
  6. Step 6: Final answer
    x = 611.55

Related Problems

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Half scale
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Double scale
Find fourth proportional to 668.70, 922.34 and 444.38
Similar ratio
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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.