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Finding the Fourth Proportional to 881.19, 1,321.38 and 361.31

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Solution

The fourth proportional to 881.19, 1,321.38 and 361.31 is: 541.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.19 : 1,321.38 = 361.31 : x
  2. Step 2: Convert to fraction form
    881.19/1,321.38 = 361.31/x
  3. Step 3: Cross multiply
    881.19x = 1,321.38 × 361.31
  4. Step 4: Simplify right side
    881.19x = 477,421.20
  5. Step 5: Solve for x
    x = 477,421.20/881.19
  6. Step 6: Final answer
    x = 541.79

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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.