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Finding the Fourth Proportional to 1,261.28, 1,891.65 and 481.25

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Solution

The fourth proportional to 1,261.28, 1,891.65 and 481.25 is: 721.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.28 : 1,891.65 = 481.25 : x
  2. Step 2: Convert to fraction form
    1,261.28/1,891.65 = 481.25/x
  3. Step 3: Cross multiply
    1,261.28x = 1,891.65 × 481.25
  4. Step 4: Simplify right side
    1,261.28x = 910,356.56
  5. Step 5: Solve for x
    x = 910,356.56/1,261.28
  6. Step 6: Final answer
    x = 721.77

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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.