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Finding the Fourth Proportional to 667.28, 1,000.64 and 320.53

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Solution

The fourth proportional to 667.28, 1,000.64 and 320.53 is: 480.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    667.28 : 1,000.64 = 320.53 : x
  2. Step 2: Convert to fraction form
    667.28/1,000.64 = 320.53/x
  3. Step 3: Cross multiply
    667.28x = 1,000.64 × 320.53
  4. Step 4: Simplify right side
    667.28x = 320,733.51
  5. Step 5: Solve for x
    x = 320,733.51/667.28
  6. Step 6: Final answer
    x = 480.66

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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.