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Finding the Fourth Proportional to 881.40, 1,321.92 and 361.28

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Solution

The fourth proportional to 881.40, 1,321.92 and 361.28 is: 541.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.40 : 1,321.92 = 361.28 : x
  2. Step 2: Convert to fraction form
    881.40/1,321.92 = 361.28/x
  3. Step 3: Cross multiply
    881.40x = 1,321.92 × 361.28
  4. Step 4: Simplify right side
    881.40x = 477,583.26
  5. Step 5: Solve for x
    x = 477,583.26/881.40
  6. Step 6: Final answer
    x = 541.85

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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.