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Finding the Fourth Proportional to 669.28, 1,003.08 and 361.12

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Solution

The fourth proportional to 669.28, 1,003.08 and 361.12 is: 541.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    669.28 : 1,003.08 = 361.12 : x
  2. Step 2: Convert to fraction form
    669.28/1,003.08 = 361.12/x
  3. Step 3: Cross multiply
    669.28x = 1,003.08 × 361.12
  4. Step 4: Simplify right side
    669.28x = 362,232.25
  5. Step 5: Solve for x
    x = 362,232.25/669.28
  6. Step 6: Final answer
    x = 541.23

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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.