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Finding the Fourth Proportional to 669.83, 1,004.78 and 426.83

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Solution

The fourth proportional to 669.83, 1,004.78 and 426.83 is: 640.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.83 : 1,004.78 = 426.83 : x
  2. Step 2: Convert to fraction form
    669.83/1,004.78 = 426.83/x
  3. Step 3: Cross multiply
    669.83x = 1,004.78 × 426.83
  4. Step 4: Simplify right side
    669.83x = 428,866.29
  5. Step 5: Solve for x
    x = 428,866.29/669.83
  6. Step 6: Final answer
    x = 640.27

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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.