Home / 3,869.85-5,340.39-2,101.45

Finding the Fourth Proportional to 3,869.85, 5,340.39 and 2,101.45

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Solution

The fourth proportional to 3,869.85, 5,340.39 and 2,101.45 is: 2,900.00

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,869.85 : 5,340.39 = 2,101.45 : x
  2. Step 2: Convert to fraction form
    3,869.85/5,340.39 = 2,101.45/x
  3. Step 3: Cross multiply
    3,869.85x = 5,340.39 × 2,101.45
  4. Step 4: Simplify right side
    3,869.85x = 11,222,562.57
  5. Step 5: Solve for x
    x = 11,222,562.57/3,869.85
  6. Step 6: Final answer
    x = 2,900.00

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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.