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Finding the Fourth Proportional to 15,858.94, 21,885.78 and 8,786.02

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Solution

The fourth proportional to 15,858.94, 21,885.78 and 8,786.02 is: 12,124.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,858.94 : 21,885.78 = 8,786.02 : x
  2. Step 2: Convert to fraction form
    15,858.94/21,885.78 = 8,786.02/x
  3. Step 3: Cross multiply
    15,858.94x = 21,885.78 × 8,786.02
  4. Step 4: Simplify right side
    15,858.94x = 192,288,900.80
  5. Step 5: Solve for x
    x = 192,288,900.80/15,858.94
  6. Step 6: Final answer
    x = 12,124.95

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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.