Home / 13,920.12-20,856.72-6,890.76

Finding the Fourth Proportional to 13,920.12, 20,856.72 and 6,890.76

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Solution

The fourth proportional to 13,920.12, 20,856.72 and 6,890.76 is: 10,324.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,920.12 : 20,856.72 = 6,890.76 : x
  2. Step 2: Convert to fraction form
    13,920.12/20,856.72 = 6,890.76/x
  3. Step 3: Cross multiply
    13,920.12x = 20,856.72 × 6,890.76
  4. Step 4: Simplify right side
    13,920.12x = 143,718,651.91
  5. Step 5: Solve for x
    x = 143,718,651.91/13,920.12
  6. Step 6: Final answer
    x = 10,324.53

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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.