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Finding the Fourth Proportional to 1,297.31, 1,947.92 and 813.47

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Solution

The fourth proportional to 1,297.31, 1,947.92 and 813.47 is: 1,221.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,297.31 : 1,947.92 = 813.47 : x
  2. Step 2: Convert to fraction form
    1,297.31/1,947.92 = 813.47/x
  3. Step 3: Cross multiply
    1,297.31x = 1,947.92 × 813.47
  4. Step 4: Simplify right side
    1,297.31x = 1,584,560.68
  5. Step 5: Solve for x
    x = 1,584,560.68/1,297.31
  6. Step 6: Final answer
    x = 1,221.42

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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.