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Finding the Fourth Proportional to 3,900.71, 5,389.86 and 2,890.97

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Solution

The fourth proportional to 3,900.71, 5,389.86 and 2,890.97 is: 3,994.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,900.71 : 5,389.86 = 2,890.97 : x
  2. Step 2: Convert to fraction form
    3,900.71/5,389.86 = 2,890.97/x
  3. Step 3: Cross multiply
    3,900.71x = 5,389.86 × 2,890.97
  4. Step 4: Simplify right side
    3,900.71x = 15,581,923.56
  5. Step 5: Solve for x
    x = 15,581,923.56/3,900.71
  6. Step 6: Final answer
    x = 3,994.64

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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.