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Finding the Fourth Proportional to 13,579.80, 20,369.70 and 11,149.80

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Solution

The fourth proportional to 13,579.80, 20,369.70 and 11,149.80 is: 16,724.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,579.80 : 20,369.70 = 11,149.80 : x
  2. Step 2: Convert to fraction form
    13,579.80/20,369.70 = 11,149.80/x
  3. Step 3: Cross multiply
    13,579.80x = 20,369.70 × 11,149.80
  4. Step 4: Simplify right side
    13,579.80x = 227,118,081.06
  5. Step 5: Solve for x
    x = 227,118,081.06/13,579.80
  6. Step 6: Final answer
    x = 16,724.70

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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.