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Finding the Fourth Proportional to 881.54, 1,321.70 and 361.39

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Solution

The fourth proportional to 881.54, 1,321.70 and 361.39 is: 541.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.54 : 1,321.70 = 361.39 : x
  2. Step 2: Convert to fraction form
    881.54/1,321.70 = 361.39/x
  3. Step 3: Cross multiply
    881.54x = 1,321.70 × 361.39
  4. Step 4: Simplify right side
    881.54x = 477,646.76
  5. Step 5: Solve for x
    x = 477,646.76/881.54
  6. Step 6: Final answer
    x = 541.84

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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.