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Finding the Fourth Proportional to 764.28, 1,138.37 and 748.28

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Solution

The fourth proportional to 764.28, 1,138.37 and 748.28 is: 1,114.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    764.28 : 1,138.37 = 748.28 : x
  2. Step 2: Convert to fraction form
    764.28/1,138.37 = 748.28/x
  3. Step 3: Cross multiply
    764.28x = 1,138.37 × 748.28
  4. Step 4: Simplify right side
    764.28x = 851,819.50
  5. Step 5: Solve for x
    x = 851,819.50/764.28
  6. Step 6: Final answer
    x = 1,114.54

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.