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Finding the Fourth Proportional to 2,189.50, 3,283.92 and 728.47

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Solution

The fourth proportional to 2,189.50, 3,283.92 and 728.47 is: 1,092.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.50 : 3,283.92 = 728.47 : x
  2. Step 2: Convert to fraction form
    2,189.50/3,283.92 = 728.47/x
  3. Step 3: Cross multiply
    2,189.50x = 3,283.92 × 728.47
  4. Step 4: Simplify right side
    2,189.50x = 2,392,237.20
  5. Step 5: Solve for x
    x = 2,392,237.20/2,189.50
  6. Step 6: Final answer
    x = 1,092.60

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1.5x scale

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.