Home / 15,786.29-21,811.78-12,215.81

Finding the Fourth Proportional to 15,786.29, 21,811.78 and 12,215.81

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Solution

The fourth proportional to 15,786.29, 21,811.78 and 12,215.81 is: 16,878.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,786.29 : 21,811.78 = 12,215.81 : x
  2. Step 2: Convert to fraction form
    15,786.29/21,811.78 = 12,215.81/x
  3. Step 3: Cross multiply
    15,786.29x = 21,811.78 × 12,215.81
  4. Step 4: Simplify right side
    15,786.29x = 266,448,630.04
  5. Step 5: Solve for x
    x = 266,448,630.04/15,786.29
  6. Step 6: Final answer
    x = 16,878.48

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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.