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Finding the Fourth Proportional to 881.19, 1,321.96 and 394.25

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Solution

The fourth proportional to 881.19, 1,321.96 and 394.25 is: 591.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.19 : 1,321.96 = 394.25 : x
  2. Step 2: Convert to fraction form
    881.19/1,321.96 = 394.25/x
  3. Step 3: Cross multiply
    881.19x = 1,321.96 × 394.25
  4. Step 4: Simplify right side
    881.19x = 521,175.87
  5. Step 5: Solve for x
    x = 521,175.87/881.19
  6. Step 6: Final answer
    x = 591.45

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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.