Home / 13,869.68-20,813.88-5,111.60

Finding the Fourth Proportional to 13,869.68, 20,813.88 and 5,111.60

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Solution

The fourth proportional to 13,869.68, 20,813.88 and 5,111.60 is: 7,670.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,869.68 : 20,813.88 = 5,111.60 : x
  2. Step 2: Convert to fraction form
    13,869.68/20,813.88 = 5,111.60/x
  3. Step 3: Cross multiply
    13,869.68x = 20,813.88 × 5,111.60
  4. Step 4: Simplify right side
    13,869.68x = 106,392,229.01
  5. Step 5: Solve for x
    x = 106,392,229.01/13,869.68
  6. Step 6: Final answer
    x = 7,670.85

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.