Home / 13,904.91-20,856.15-5,139.90

Finding the Fourth Proportional to 13,904.91, 20,856.15 and 5,139.90

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Solution

The fourth proportional to 13,904.91, 20,856.15 and 5,139.90 is: 7,709.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,904.91 : 20,856.15 = 5,139.90 : x
  2. Step 2: Convert to fraction form
    13,904.91/20,856.15 = 5,139.90/x
  3. Step 3: Cross multiply
    13,904.91x = 20,856.15 × 5,139.90
  4. Step 4: Simplify right side
    13,904.91x = 107,198,525.39
  5. Step 5: Solve for x
    x = 107,198,525.39/13,904.91
  6. Step 6: Final answer
    x = 7,709.40

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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.