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Finding the Fourth Proportional to 1,251.76, 1,727.60 and 728

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Solution

The fourth proportional to 1,251.76, 1,727.60 and 728 is: 1,004.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,251.76 : 1,727.60 = 728 : x
  2. Step 2: Convert to fraction form
    1,251.76/1,727.60 = 728/x
  3. Step 3: Cross multiply
    1,251.76x = 1,727.60 × 728
  4. Step 4: Simplify right side
    1,251.76x = 1,257,692.80
  5. Step 5: Solve for x
    x = 1,257,692.80/1,251.76
  6. Step 6: Final answer
    x = 1,004.74

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.