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Finding the Fourth Proportional to 2,189.75, 3,285.12 and 728.91

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Solution

The fourth proportional to 2,189.75, 3,285.12 and 728.91 is: 1,093.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,189.75 : 3,285.12 = 728.91 : x
  2. Step 2: Convert to fraction form
    2,189.75/3,285.12 = 728.91/x
  3. Step 3: Cross multiply
    2,189.75x = 3,285.12 × 728.91
  4. Step 4: Simplify right side
    2,189.75x = 2,394,559.55
  5. Step 5: Solve for x
    x = 2,394,559.55/2,189.75
  6. Step 6: Final answer
    x = 1,093.53

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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.