Home / 20,814.10-28,720.10-11,861.78

Finding the Fourth Proportional to 20,814.10, 28,720.10 and 11,861.78

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Solution

The fourth proportional to 20,814.10, 28,720.10 and 11,861.78 is: 16,367.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,814.10 : 28,720.10 = 11,861.78 : x
  2. Step 2: Convert to fraction form
    20,814.10/28,720.10 = 11,861.78/x
  3. Step 3: Cross multiply
    20,814.10x = 28,720.10 × 11,861.78
  4. Step 4: Simplify right side
    20,814.10x = 340,671,393.83
  5. Step 5: Solve for x
    x = 340,671,393.83/20,814.10
  6. Step 6: Final answer
    x = 16,367.34

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.