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Finding the Fourth Proportional to 669.27, 1,005.53 and 426.27

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Solution

The fourth proportional to 669.27, 1,005.53 and 426.27 is: 640.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.27 : 1,005.53 = 426.27 : x
  2. Step 2: Convert to fraction form
    669.27/1,005.53 = 426.27/x
  3. Step 3: Cross multiply
    669.27x = 1,005.53 × 426.27
  4. Step 4: Simplify right side
    669.27x = 428,625.14
  5. Step 5: Solve for x
    x = 428,625.14/669.27
  6. Step 6: Final answer
    x = 640.44

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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.