Home / 15,786.96-21,785.68-8,616.64

Finding the Fourth Proportional to 15,786.96, 21,785.68 and 8,616.64

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Solution

The fourth proportional to 15,786.96, 21,785.68 and 8,616.64 is: 11,890.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,786.96 : 21,785.68 = 8,616.64 : x
  2. Step 2: Convert to fraction form
    15,786.96/21,785.68 = 8,616.64/x
  3. Step 3: Cross multiply
    15,786.96x = 21,785.68 × 8,616.64
  4. Step 4: Simplify right side
    15,786.96x = 187,719,318.63
  5. Step 5: Solve for x
    x = 187,719,318.63/15,786.96
  6. Step 6: Final answer
    x = 11,890.78

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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.