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Finding the Fourth Proportional to 1,678.54, 2,517.72 and 800.40

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Solution

The fourth proportional to 1,678.54, 2,517.72 and 800.40 is: 1,200.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,678.54 : 2,517.72 = 800.40 : x
  2. Step 2: Convert to fraction form
    1,678.54/2,517.72 = 800.40/x
  3. Step 3: Cross multiply
    1,678.54x = 2,517.72 × 800.40
  4. Step 4: Simplify right side
    1,678.54x = 2,015,183.09
  5. Step 5: Solve for x
    x = 2,015,183.09/1,678.54
  6. Step 6: Final answer
    x = 1,200.56

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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.