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Finding the Fourth Proportional to 1,398.33, 1,930.03 and 809.19

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Solution

The fourth proportional to 1,398.33, 1,930.03 and 809.19 is: 1,116.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.33 : 1,930.03 = 809.19 : x
  2. Step 2: Convert to fraction form
    1,398.33/1,930.03 = 809.19/x
  3. Step 3: Cross multiply
    1,398.33x = 1,930.03 × 809.19
  4. Step 4: Simplify right side
    1,398.33x = 1,561,758.95
  5. Step 5: Solve for x
    x = 1,561,758.95/1,398.33
  6. Step 6: Final answer
    x = 1,116.87

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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.