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Finding the Fourth Proportional to 13,856.80, 20,785.20 and 12,359.20

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Solution

The fourth proportional to 13,856.80, 20,785.20 and 12,359.20 is: 18,538.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,856.80 : 20,785.20 = 12,359.20 : x
  2. Step 2: Convert to fraction form
    13,856.80/20,785.20 = 12,359.20/x
  3. Step 3: Cross multiply
    13,856.80x = 20,785.20 × 12,359.20
  4. Step 4: Simplify right side
    13,856.80x = 256,888,443.84
  5. Step 5: Solve for x
    x = 256,888,443.84/13,856.80
  6. Step 6: Final answer
    x = 18,538.80

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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.