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Finding the Fourth Proportional to 2,189, 3,283.50 and 728.15

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Solution

The fourth proportional to 2,189, 3,283.50 and 728.15 is: 1,092.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189 : 3,283.50 = 728.15 : x
  2. Step 2: Convert to fraction form
    2,189/3,283.50 = 728.15/x
  3. Step 3: Cross multiply
    2,189x = 3,283.50 × 728.15
  4. Step 4: Simplify right side
    2,189x = 2,390,880.53
  5. Step 5: Solve for x
    x = 2,390,880.53/2,189
  6. Step 6: Final answer
    x = 1,092.23

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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.