Home / 20,856.99-28,785.06-11,905.78

Finding the Fourth Proportional to 20,856.99, 28,785.06 and 11,905.78

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Solution

The fourth proportional to 20,856.99, 28,785.06 and 11,905.78 is: 16,431.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,856.99 : 28,785.06 = 11,905.78 : x
  2. Step 2: Convert to fraction form
    20,856.99/28,785.06 = 11,905.78/x
  3. Step 3: Cross multiply
    20,856.99x = 28,785.06 × 11,905.78
  4. Step 4: Simplify right side
    20,856.99x = 342,708,591.65
  5. Step 5: Solve for x
    x = 342,708,591.65/20,856.99
  6. Step 6: Final answer
    x = 16,431.35

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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.