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Finding the Fourth Proportional to 3,687.86, 5,089.20 and 2,115.92

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Solution

The fourth proportional to 3,687.86, 5,089.20 and 2,115.92 is: 2,919.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,687.86 : 5,089.20 = 2,115.92 : x
  2. Step 2: Convert to fraction form
    3,687.86/5,089.20 = 2,115.92/x
  3. Step 3: Cross multiply
    3,687.86x = 5,089.20 × 2,115.92
  4. Step 4: Simplify right side
    3,687.86x = 10,768,340.06
  5. Step 5: Solve for x
    x = 10,768,340.06/3,687.86
  6. Step 6: Final answer
    x = 2,919.94

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.