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Finding the Fourth Proportional to 881.22, 1,320.87 and 387.18

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Solution

The fourth proportional to 881.22, 1,320.87 and 387.18 is: 580.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    881.22 : 1,320.87 = 387.18 : x
  2. Step 2: Convert to fraction form
    881.22/1,320.87 = 387.18/x
  3. Step 3: Cross multiply
    881.22x = 1,320.87 × 387.18
  4. Step 4: Simplify right side
    881.22x = 511,420.85
  5. Step 5: Solve for x
    x = 511,420.85/881.22
  6. Step 6: Final answer
    x = 580.36

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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.