Home / 20,786.90-31,196.14-8,138.75

Finding the Fourth Proportional to 20,786.90, 31,196.14 and 8,138.75

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Solution

The fourth proportional to 20,786.90, 31,196.14 and 8,138.75 is: 12,214.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.90 : 31,196.14 = 8,138.75 : x
  2. Step 2: Convert to fraction form
    20,786.90/31,196.14 = 8,138.75/x
  3. Step 3: Cross multiply
    20,786.90x = 31,196.14 × 8,138.75
  4. Step 4: Simplify right side
    20,786.90x = 253,897,408.10
  5. Step 5: Solve for x
    x = 253,897,408.10/20,786.90
  6. Step 6: Final answer
    x = 12,214.30

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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.