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Finding the Fourth Proportional to 15,885.62, 21,921.54 and 8,811.92

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Solution

The fourth proportional to 15,885.62, 21,921.54 and 8,811.92 is: 12,160.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,885.62 : 21,921.54 = 8,811.92 : x
  2. Step 2: Convert to fraction form
    15,885.62/21,921.54 = 8,811.92/x
  3. Step 3: Cross multiply
    15,885.62x = 21,921.54 × 8,811.92
  4. Step 4: Simplify right side
    15,885.62x = 193,170,856.76
  5. Step 5: Solve for x
    x = 193,170,856.76/15,885.62
  6. Step 6: Final answer
    x = 12,160.11

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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.