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Finding the Fourth Proportional to 15,860.34, 21,887.28 and 8,786.88

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Solution

The fourth proportional to 15,860.34, 21,887.28 and 8,786.88 is: 12,125.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,860.34 : 21,887.28 = 8,786.88 : x
  2. Step 2: Convert to fraction form
    15,860.34/21,887.28 = 8,786.88/x
  3. Step 3: Cross multiply
    15,860.34x = 21,887.28 × 8,786.88
  4. Step 4: Simplify right side
    15,860.34x = 192,320,902.89
  5. Step 5: Solve for x
    x = 192,320,902.89/15,860.34
  6. Step 6: Final answer
    x = 12,125.90

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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.