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Finding the Fourth Proportional to 20,863.80, 31,295.70 and 9,199.80

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Solution

The fourth proportional to 20,863.80, 31,295.70 and 9,199.80 is: 13,799.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,863.80 : 31,295.70 = 9,199.80 : x
  2. Step 2: Convert to fraction form
    20,863.80/31,295.70 = 9,199.80/x
  3. Step 3: Cross multiply
    20,863.80x = 31,295.70 × 9,199.80
  4. Step 4: Simplify right side
    20,863.80x = 287,914,180.86
  5. Step 5: Solve for x
    x = 287,914,180.86/20,863.80
  6. Step 6: Final answer
    x = 13,799.70

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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.