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Finding the Fourth Proportional to 1,919.92, 2,879.60 and 687.28

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Solution

The fourth proportional to 1,919.92, 2,879.60 and 687.28 is: 1,030.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,919.92 : 2,879.60 = 687.28 : x
  2. Step 2: Convert to fraction form
    1,919.92/2,879.60 = 687.28/x
  3. Step 3: Cross multiply
    1,919.92x = 2,879.60 × 687.28
  4. Step 4: Simplify right side
    1,919.92x = 1,979,091.49
  5. Step 5: Solve for x
    x = 1,979,091.49/1,919.92
  6. Step 6: Final answer
    x = 1,030.82

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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.