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Finding the Fourth Proportional to 15,889.92, 21,928.08 and 8,719.88

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Solution

The fourth proportional to 15,889.92, 21,928.08 and 8,719.88 is: 12,033.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,889.92 : 21,928.08 = 8,719.88 : x
  2. Step 2: Convert to fraction form
    15,889.92/21,928.08 = 8,719.88/x
  3. Step 3: Cross multiply
    15,889.92x = 21,928.08 × 8,719.88
  4. Step 4: Simplify right side
    15,889.92x = 191,210,137.39
  5. Step 5: Solve for x
    x = 191,210,137.39/15,889.92
  6. Step 6: Final answer
    x = 12,033.42

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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.