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Finding the Fourth Proportional to 669.20, 1,002.92 and 361.13

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Solution

The fourth proportional to 669.20, 1,002.92 and 361.13 is: 541.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.20 : 1,002.92 = 361.13 : x
  2. Step 2: Convert to fraction form
    669.20/1,002.92 = 361.13/x
  3. Step 3: Cross multiply
    669.20x = 1,002.92 × 361.13
  4. Step 4: Simplify right side
    669.20x = 362,177.68
  5. Step 5: Solve for x
    x = 362,177.68/669.20
  6. Step 6: Final answer
    x = 541.21

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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.