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Finding the Fourth Proportional to 15,884.85, 21,920.79 and 8,811.12

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Solution

The fourth proportional to 15,884.85, 21,920.79 and 8,811.12 is: 12,159.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,884.85 : 21,920.79 = 8,811.12 : x
  2. Step 2: Convert to fraction form
    15,884.85/21,920.79 = 8,811.12/x
  3. Step 3: Cross multiply
    15,884.85x = 21,920.79 × 8,811.12
  4. Step 4: Simplify right side
    15,884.85x = 193,146,711.18
  5. Step 5: Solve for x
    x = 193,146,711.18/15,884.85
  6. Step 6: Final answer
    x = 12,159.18

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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.