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Finding the Fourth Proportional to 13,321.80, 19,982.70 and 12,553.80

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Solution

The fourth proportional to 13,321.80, 19,982.70 and 12,553.80 is: 18,830.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,321.80 : 19,982.70 = 12,553.80 : x
  2. Step 2: Convert to fraction form
    13,321.80/19,982.70 = 12,553.80/x
  3. Step 3: Cross multiply
    13,321.80x = 19,982.70 × 12,553.80
  4. Step 4: Simplify right side
    13,321.80x = 250,858,819.26
  5. Step 5: Solve for x
    x = 250,858,819.26/13,321.80
  6. Step 6: Final answer
    x = 18,830.70

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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.