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Finding the Fourth Proportional to 1,261.73, 1,891.31 and 439.79

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Solution

The fourth proportional to 1,261.73, 1,891.31 and 439.79 is: 659.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,261.73 : 1,891.31 = 439.79 : x
  2. Step 2: Convert to fraction form
    1,261.73/1,891.31 = 439.79/x
  3. Step 3: Cross multiply
    1,261.73x = 1,891.31 × 439.79
  4. Step 4: Simplify right side
    1,261.73x = 831,767.57
  5. Step 5: Solve for x
    x = 831,767.57/1,261.73
  6. Step 6: Final answer
    x = 659.23

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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.