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Finding the Fourth Proportional to 1,383.28, 1,909.10 and 794

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Solution

The fourth proportional to 1,383.28, 1,909.10 and 794 is: 1,095.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,383.28 : 1,909.10 = 794 : x
  2. Step 2: Convert to fraction form
    1,383.28/1,909.10 = 794/x
  3. Step 3: Cross multiply
    1,383.28x = 1,909.10 × 794
  4. Step 4: Simplify right side
    1,383.28x = 1,515,825.40
  5. Step 5: Solve for x
    x = 1,515,825.40/1,383.28
  6. Step 6: Final answer
    x = 1,095.82

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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.