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Finding the Fourth Proportional to 13,871.09, 20,811.87 and 8,328.29

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Solution

The fourth proportional to 13,871.09, 20,811.87 and 8,328.29 is: 12,495.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,871.09 : 20,811.87 = 8,328.29 : x
  2. Step 2: Convert to fraction form
    13,871.09/20,811.87 = 8,328.29/x
  3. Step 3: Cross multiply
    13,871.09x = 20,811.87 × 8,328.29
  4. Step 4: Simplify right side
    13,871.09x = 173,327,247.16
  5. Step 5: Solve for x
    x = 173,327,247.16/13,871.09
  6. Step 6: Final answer
    x = 12,495.58

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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.