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Finding the Fourth Proportional to 669.09, 1,002.96 and 379.92

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Solution

The fourth proportional to 669.09, 1,002.96 and 379.92 is: 569.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.09 : 1,002.96 = 379.92 : x
  2. Step 2: Convert to fraction form
    669.09/1,002.96 = 379.92/x
  3. Step 3: Cross multiply
    669.09x = 1,002.96 × 379.92
  4. Step 4: Simplify right side
    669.09x = 381,044.56
  5. Step 5: Solve for x
    x = 381,044.56/669.09
  6. Step 6: Final answer
    x = 569.50

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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.