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Finding the Fourth Proportional to 2,686.87, 3,997.79 and 2,619.91

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Solution

The fourth proportional to 2,686.87, 3,997.79 and 2,619.91 is: 3,898.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,686.87 : 3,997.79 = 2,619.91 : x
  2. Step 2: Convert to fraction form
    2,686.87/3,997.79 = 2,619.91/x
  3. Step 3: Cross multiply
    2,686.87x = 3,997.79 × 2,619.91
  4. Step 4: Simplify right side
    2,686.87x = 10,473,830.01
  5. Step 5: Solve for x
    x = 10,473,830.01/2,686.87
  6. Step 6: Final answer
    x = 3,898.16

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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.