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Finding the Fourth Proportional to 15,884.32, 21,920.52 and 8,811.44

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Solution

The fourth proportional to 15,884.32, 21,920.52 and 8,811.44 is: 12,159.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,884.32 : 21,920.52 = 8,811.44 : x
  2. Step 2: Convert to fraction form
    15,884.32/21,920.52 = 8,811.44/x
  3. Step 3: Cross multiply
    15,884.32x = 21,920.52 × 8,811.44
  4. Step 4: Simplify right side
    15,884.32x = 193,151,346.75
  5. Step 5: Solve for x
    x = 193,151,346.75/15,884.32
  6. Step 6: Final answer
    x = 12,159.88

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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.