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Finding the Fourth Proportional to 667.23, 1,000.85 and 320.49

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Solution

The fourth proportional to 667.23, 1,000.85 and 320.49 is: 480.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.23 : 1,000.85 = 320.49 : x
  2. Step 2: Convert to fraction form
    667.23/1,000.85 = 320.49/x
  3. Step 3: Cross multiply
    667.23x = 1,000.85 × 320.49
  4. Step 4: Simplify right side
    667.23x = 320,760.81
  5. Step 5: Solve for x
    x = 320,760.81/667.23
  6. Step 6: Final answer
    x = 480.74

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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.