Home / 20,135.76-27,789.78-12,178.73

Finding the Fourth Proportional to 20,135.76, 27,789.78 and 12,178.73

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Solution

The fourth proportional to 20,135.76, 27,789.78 and 12,178.73 is: 16,808.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,135.76 : 27,789.78 = 12,178.73 : x
  2. Step 2: Convert to fraction form
    20,135.76/27,789.78 = 12,178.73/x
  3. Step 3: Cross multiply
    20,135.76x = 27,789.78 × 12,178.73
  4. Step 4: Simplify right side
    20,135.76x = 338,444,088.43
  5. Step 5: Solve for x
    x = 338,444,088.43/20,135.76
  6. Step 6: Final answer
    x = 16,808.11

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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.