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Finding the Fourth Proportional to 13,998.90, 20,998.35 and 8,085.90

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Solution

The fourth proportional to 13,998.90, 20,998.35 and 8,085.90 is: 12,128.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,998.90 : 20,998.35 = 8,085.90 : x
  2. Step 2: Convert to fraction form
    13,998.90/20,998.35 = 8,085.90/x
  3. Step 3: Cross multiply
    13,998.90x = 20,998.35 × 8,085.90
  4. Step 4: Simplify right side
    13,998.90x = 169,790,558.27
  5. Step 5: Solve for x
    x = 169,790,558.27/13,998.90
  6. Step 6: Final answer
    x = 12,128.85

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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.