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Finding the Fourth Proportional to 1,099.31, 1,648.78 and 329.63

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Solution

The fourth proportional to 1,099.31, 1,648.78 and 329.63 is: 494.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,099.31 : 1,648.78 = 329.63 : x
  2. Step 2: Convert to fraction form
    1,099.31/1,648.78 = 329.63/x
  3. Step 3: Cross multiply
    1,099.31x = 1,648.78 × 329.63
  4. Step 4: Simplify right side
    1,099.31x = 543,478.28
  5. Step 5: Solve for x
    x = 543,478.28/1,099.31
  6. Step 6: Final answer
    x = 494.38

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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.