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Finding the Fourth Proportional to 13,914.76, 20,861.18 and 6,889.86

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Solution

The fourth proportional to 13,914.76, 20,861.18 and 6,889.86 is: 10,329.36

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,914.76 : 20,861.18 = 6,889.86 : x
  2. Step 2: Convert to fraction form
    13,914.76/20,861.18 = 6,889.86/x
  3. Step 3: Cross multiply
    13,914.76x = 20,861.18 × 6,889.86
  4. Step 4: Simplify right side
    13,914.76x = 143,730,609.63
  5. Step 5: Solve for x
    x = 143,730,609.63/13,914.76
  6. Step 6: Final answer
    x = 10,329.36

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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.