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Finding the Fourth Proportional to 881.49, 1,321.29 and 393.87

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Solution

The fourth proportional to 881.49, 1,321.29 and 393.87 is: 590.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.49 : 1,321.29 = 393.87 : x
  2. Step 2: Convert to fraction form
    881.49/1,321.29 = 393.87/x
  3. Step 3: Cross multiply
    881.49x = 1,321.29 × 393.87
  4. Step 4: Simplify right side
    881.49x = 520,416.49
  5. Step 5: Solve for x
    x = 520,416.49/881.49
  6. Step 6: Final answer
    x = 590.38

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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.