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Finding the Fourth Proportional to 891.88, 1,338.40 and 481.31

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Solution

The fourth proportional to 891.88, 1,338.40 and 481.31 is: 722.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    891.88 : 1,338.40 = 481.31 : x
  2. Step 2: Convert to fraction form
    891.88/1,338.40 = 481.31/x
  3. Step 3: Cross multiply
    891.88x = 1,338.40 × 481.31
  4. Step 4: Simplify right side
    891.88x = 644,185.30
  5. Step 5: Solve for x
    x = 644,185.30/891.88
  6. Step 6: Final answer
    x = 722.28

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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.