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Finding the Fourth Proportional to 1,398.88, 1,930.26 and 809.20

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Solution

The fourth proportional to 1,398.88, 1,930.26 and 809.20 is: 1,116.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,398.88 : 1,930.26 = 809.20 : x
  2. Step 2: Convert to fraction form
    1,398.88/1,930.26 = 809.20/x
  3. Step 3: Cross multiply
    1,398.88x = 1,930.26 × 809.20
  4. Step 4: Simplify right side
    1,398.88x = 1,561,966.39
  5. Step 5: Solve for x
    x = 1,561,966.39/1,398.88
  6. Step 6: Final answer
    x = 1,116.58

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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.