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Finding the Fourth Proportional to 13,892.91, 20,834.50 and 8,619.81

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Solution

The fourth proportional to 13,892.91, 20,834.50 and 8,619.81 is: 12,926.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,892.91 : 20,834.50 = 8,619.81 : x
  2. Step 2: Convert to fraction form
    13,892.91/20,834.50 = 8,619.81/x
  3. Step 3: Cross multiply
    13,892.91x = 20,834.50 × 8,619.81
  4. Step 4: Simplify right side
    13,892.91x = 179,589,431.45
  5. Step 5: Solve for x
    x = 179,589,431.45/13,892.91
  6. Step 6: Final answer
    x = 12,926.70

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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.