Home / 20,786.70-31,187.79-12,472.68

Finding the Fourth Proportional to 20,786.70, 31,187.79 and 12,472.68

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Solution

The fourth proportional to 20,786.70, 31,187.79 and 12,472.68 is: 18,713.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,786.70 : 31,187.79 = 12,472.68 : x
  2. Step 2: Convert to fraction form
    20,786.70/31,187.79 = 12,472.68/x
  3. Step 3: Cross multiply
    20,786.70x = 31,187.79 × 12,472.68
  4. Step 4: Simplify right side
    20,786.70x = 388,995,215.43
  5. Step 5: Solve for x
    x = 388,995,215.43/20,786.70
  6. Step 6: Final answer
    x = 18,713.66

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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.