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Finding the Fourth Proportional to 669.24, 1,003.41 and 409.32

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Solution

The fourth proportional to 669.24, 1,003.41 and 409.32 is: 613.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.24 : 1,003.41 = 409.32 : x
  2. Step 2: Convert to fraction form
    669.24/1,003.41 = 409.32/x
  3. Step 3: Cross multiply
    669.24x = 1,003.41 × 409.32
  4. Step 4: Simplify right side
    669.24x = 410,715.78
  5. Step 5: Solve for x
    x = 410,715.78/669.24
  6. Step 6: Final answer
    x = 613.70

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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.