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Finding the Fourth Proportional to 1,378.44, 2,065.82 and 728.68

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Solution

The fourth proportional to 1,378.44, 2,065.82 and 728.68 is: 1,092.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,378.44 : 2,065.82 = 728.68 : x
  2. Step 2: Convert to fraction form
    1,378.44/2,065.82 = 728.68/x
  3. Step 3: Cross multiply
    1,378.44x = 2,065.82 × 728.68
  4. Step 4: Simplify right side
    1,378.44x = 1,505,321.72
  5. Step 5: Solve for x
    x = 1,505,321.72/1,378.44
  6. Step 6: Final answer
    x = 1,092.05

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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.