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Finding the Fourth Proportional to 15,859.72, 21,886.43 and 8,786.13

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Solution

The fourth proportional to 15,859.72, 21,886.43 and 8,786.13 is: 12,124.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,859.72 : 21,886.43 = 8,786.13 : x
  2. Step 2: Convert to fraction form
    15,859.72/21,886.43 = 8,786.13/x
  3. Step 3: Cross multiply
    15,859.72x = 21,886.43 × 8,786.13
  4. Step 4: Simplify right side
    15,859.72x = 192,297,019.22
  5. Step 5: Solve for x
    x = 192,297,019.22/15,859.72
  6. Step 6: Final answer
    x = 12,124.87

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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.