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Finding the Fourth Proportional to 669.50, 1,004.38 and 395.78

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Solution

The fourth proportional to 669.50, 1,004.38 and 395.78 is: 593.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.50 : 1,004.38 = 395.78 : x
  2. Step 2: Convert to fraction form
    669.50/1,004.38 = 395.78/x
  3. Step 3: Cross multiply
    669.50x = 1,004.38 × 395.78
  4. Step 4: Simplify right side
    669.50x = 397,515.04
  5. Step 5: Solve for x
    x = 397,515.04/669.50
  6. Step 6: Final answer
    x = 593.75

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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.