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Finding the Fourth Proportional to 967.82, 1,451.72 and 640.85

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Solution

The fourth proportional to 967.82, 1,451.72 and 640.85 is: 961.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    967.82 : 1,451.72 = 640.85 : x
  2. Step 2: Convert to fraction form
    967.82/1,451.72 = 640.85/x
  3. Step 3: Cross multiply
    967.82x = 1,451.72 × 640.85
  4. Step 4: Simplify right side
    967.82x = 930,329.11
  5. Step 5: Solve for x
    x = 930,329.11/967.82
  6. Step 6: Final answer
    x = 961.27

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.