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Finding the Fourth Proportional to 15,882.80, 21,919.60 and 8,811.50

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Solution

The fourth proportional to 15,882.80, 21,919.60 and 8,811.50 is: 12,160.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,882.80 : 21,919.60 = 8,811.50 : x
  2. Step 2: Convert to fraction form
    15,882.80/21,919.60 = 8,811.50/x
  3. Step 3: Cross multiply
    15,882.80x = 21,919.60 × 8,811.50
  4. Step 4: Simplify right side
    15,882.80x = 193,144,555.40
  5. Step 5: Solve for x
    x = 193,144,555.40/15,882.80
  6. Step 6: Final answer
    x = 12,160.61

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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.