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Finding the Fourth Proportional to 15,859.70, 21,887.10 and 8,786.12

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Solution

The fourth proportional to 15,859.70, 21,887.10 and 8,786.12 is: 12,125.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,859.70 : 21,887.10 = 8,786.12 : x
  2. Step 2: Convert to fraction form
    15,859.70/21,887.10 = 8,786.12/x
  3. Step 3: Cross multiply
    15,859.70x = 21,887.10 × 8,786.12
  4. Step 4: Simplify right side
    15,859.70x = 192,302,687.05
  5. Step 5: Solve for x
    x = 192,302,687.05/15,859.70
  6. Step 6: Final answer
    x = 12,125.24

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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.