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Finding the Fourth Proportional to 13,990.11, 20,978.04 and 6,874.83

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Solution

The fourth proportional to 13,990.11, 20,978.04 and 6,874.83 is: 10,308.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,990.11 : 20,978.04 = 6,874.83 : x
  2. Step 2: Convert to fraction form
    13,990.11/20,978.04 = 6,874.83/x
  3. Step 3: Cross multiply
    13,990.11x = 20,978.04 × 6,874.83
  4. Step 4: Simplify right side
    13,990.11x = 144,220,405.85
  5. Step 5: Solve for x
    x = 144,220,405.85/13,990.11
  6. Step 6: Final answer
    x = 10,308.74

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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.