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Finding the Fourth Proportional to 1,768.57, 2,650.91 and 728.03

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Solution

The fourth proportional to 1,768.57, 2,650.91 and 728.03 is: 1,091.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,768.57 : 2,650.91 = 728.03 : x
  2. Step 2: Convert to fraction form
    1,768.57/2,650.91 = 728.03/x
  3. Step 3: Cross multiply
    1,768.57x = 2,650.91 × 728.03
  4. Step 4: Simplify right side
    1,768.57x = 1,929,944.99
  5. Step 5: Solve for x
    x = 1,929,944.99/1,768.57
  6. Step 6: Final answer
    x = 1,091.25

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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.