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Finding the Fourth Proportional to 1,248.27, 1,721.37 and 806.40

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Solution

The fourth proportional to 1,248.27, 1,721.37 and 806.40 is: 1,112.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,248.27 : 1,721.37 = 806.40 : x
  2. Step 2: Convert to fraction form
    1,248.27/1,721.37 = 806.40/x
  3. Step 3: Cross multiply
    1,248.27x = 1,721.37 × 806.40
  4. Step 4: Simplify right side
    1,248.27x = 1,388,112.77
  5. Step 5: Solve for x
    x = 1,388,112.77/1,248.27
  6. Step 6: Final answer
    x = 1,112.03

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.