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Finding the Fourth Proportional to 15,884.87, 21,920.55 and 8,811.95

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Solution

The fourth proportional to 15,884.87, 21,920.55 and 8,811.95 is: 12,160.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,884.87 : 21,920.55 = 8,811.95 : x
  2. Step 2: Convert to fraction form
    15,884.87/21,920.55 = 8,811.95/x
  3. Step 3: Cross multiply
    15,884.87x = 21,920.55 × 8,811.95
  4. Step 4: Simplify right side
    15,884.87x = 193,162,680.97
  5. Step 5: Solve for x
    x = 193,162,680.97/15,884.87
  6. Step 6: Final answer
    x = 12,160.17

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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.