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Finding the Fourth Proportional to 667.54, 1,000.68 and 320.71

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Solution

The fourth proportional to 667.54, 1,000.68 and 320.71 is: 480.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.54 : 1,000.68 = 320.71 : x
  2. Step 2: Convert to fraction form
    667.54/1,000.68 = 320.71/x
  3. Step 3: Cross multiply
    667.54x = 1,000.68 × 320.71
  4. Step 4: Simplify right side
    667.54x = 320,928.08
  5. Step 5: Solve for x
    x = 320,928.08/667.54
  6. Step 6: Final answer
    x = 480.76

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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.