Home / 15,786.38-21,785.16-8,712.75

Finding the Fourth Proportional to 15,786.38, 21,785.16 and 8,712.75

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Solution

The fourth proportional to 15,786.38, 21,785.16 and 8,712.75 is: 12,023.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,786.38 : 21,785.16 = 8,712.75 : x
  2. Step 2: Convert to fraction form
    15,786.38/21,785.16 = 8,712.75/x
  3. Step 3: Cross multiply
    15,786.38x = 21,785.16 × 8,712.75
  4. Step 4: Simplify right side
    15,786.38x = 189,808,636.45
  5. Step 5: Solve for x
    x = 189,808,636.45/15,786.38
  6. Step 6: Final answer
    x = 12,023.57

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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.