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Finding the Fourth Proportional to 21,081.92, 31,622.74 and 8,601.88

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Solution

The fourth proportional to 21,081.92, 31,622.74 and 8,601.88 is: 12,902.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,081.92 : 31,622.74 = 8,601.88 : x
  2. Step 2: Convert to fraction form
    21,081.92/31,622.74 = 8,601.88/x
  3. Step 3: Cross multiply
    21,081.92x = 31,622.74 × 8,601.88
  4. Step 4: Simplify right side
    21,081.92x = 272,015,014.75
  5. Step 5: Solve for x
    x = 272,015,014.75/21,081.92
  6. Step 6: Final answer
    x = 12,902.76

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.