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Finding the Fourth Proportional to 2,728.66, 4,092.99 and 780.87

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Solution

The fourth proportional to 2,728.66, 4,092.99 and 780.87 is: 1,171.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,728.66 : 4,092.99 = 780.87 : x
  2. Step 2: Convert to fraction form
    2,728.66/4,092.99 = 780.87/x
  3. Step 3: Cross multiply
    2,728.66x = 4,092.99 × 780.87
  4. Step 4: Simplify right side
    2,728.66x = 3,196,093.10
  5. Step 5: Solve for x
    x = 3,196,093.10/2,728.66
  6. Step 6: Final answer
    x = 1,171.31

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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.