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Finding the Fourth Proportional to 667.38, 920.87 and 372.65

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Solution

The fourth proportional to 667.38, 920.87 and 372.65 is: 514.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.38 : 920.87 = 372.65 : x
  2. Step 2: Convert to fraction form
    667.38/920.87 = 372.65/x
  3. Step 3: Cross multiply
    667.38x = 920.87 × 372.65
  4. Step 4: Simplify right side
    667.38x = 343,161.99
  5. Step 5: Solve for x
    x = 343,161.99/667.38
  6. Step 6: Final answer
    x = 514.19

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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.