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Finding the Fourth Proportional to 1,109.31, 1,663.78 and 329.30

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Solution

The fourth proportional to 1,109.31, 1,663.78 and 329.30 is: 493.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,109.31 : 1,663.78 = 329.30 : x
  2. Step 2: Convert to fraction form
    1,109.31/1,663.78 = 329.30/x
  3. Step 3: Cross multiply
    1,109.31x = 1,663.78 × 329.30
  4. Step 4: Simplify right side
    1,109.31x = 547,882.75
  5. Step 5: Solve for x
    x = 547,882.75/1,109.31
  6. Step 6: Final answer
    x = 493.90

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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.