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Finding the Fourth Proportional to 891.21, 1,334.22 and 519.88

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Solution

The fourth proportional to 891.21, 1,334.22 and 519.88 is: 778.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.21 : 1,334.22 = 519.88 : x
  2. Step 2: Convert to fraction form
    891.21/1,334.22 = 519.88/x
  3. Step 3: Cross multiply
    891.21x = 1,334.22 × 519.88
  4. Step 4: Simplify right side
    891.21x = 693,629.01
  5. Step 5: Solve for x
    x = 693,629.01/891.21
  6. Step 6: Final answer
    x = 778.30

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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.