Home / 3,868.60-5,338.68-2,100.21

Finding the Fourth Proportional to 3,868.60, 5,338.68 and 2,100.21

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Solution

The fourth proportional to 3,868.60, 5,338.68 and 2,100.21 is: 2,898.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,868.60 : 5,338.68 = 2,100.21 : x
  2. Step 2: Convert to fraction form
    3,868.60/5,338.68 = 2,100.21/x
  3. Step 3: Cross multiply
    3,868.60x = 5,338.68 × 2,100.21
  4. Step 4: Simplify right side
    3,868.60x = 11,212,349.12
  5. Step 5: Solve for x
    x = 11,212,349.12/3,868.60
  6. Step 6: Final answer
    x = 2,898.30

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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.