Home / 13,878.12-20,817.18-3,489.86

Finding the Fourth Proportional to 13,878.12, 20,817.18 and 3,489.86

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Solution

The fourth proportional to 13,878.12, 20,817.18 and 3,489.86 is: 5,234.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,878.12 : 20,817.18 = 3,489.86 : x
  2. Step 2: Convert to fraction form
    13,878.12/20,817.18 = 3,489.86/x
  3. Step 3: Cross multiply
    13,878.12x = 20,817.18 × 3,489.86
  4. Step 4: Simplify right side
    13,878.12x = 72,649,043.79
  5. Step 5: Solve for x
    x = 72,649,043.79/13,878.12
  6. Step 6: Final answer
    x = 5,234.79

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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.