Home / 20,778.91-28,676.96-12,395.41

Finding the Fourth Proportional to 20,778.91, 28,676.96 and 12,395.41

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Solution

The fourth proportional to 20,778.91, 28,676.96 and 12,395.41 is: 17,106.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,778.91 : 28,676.96 = 12,395.41 : x
  2. Step 2: Convert to fraction form
    20,778.91/28,676.96 = 12,395.41/x
  3. Step 3: Cross multiply
    20,778.91x = 28,676.96 × 12,395.41
  4. Step 4: Simplify right side
    20,778.91x = 355,462,676.75
  5. Step 5: Solve for x
    x = 355,462,676.75/20,778.91
  6. Step 6: Final answer
    x = 17,106.90

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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.