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Finding the Fourth Proportional to 21,074.64, 31,611.92 and 8,591.92

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Solution

The fourth proportional to 21,074.64, 31,611.92 and 8,591.92 is: 12,887.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,074.64 : 31,611.92 = 8,591.92 : x
  2. Step 2: Convert to fraction form
    21,074.64/31,611.92 = 8,591.92/x
  3. Step 3: Cross multiply
    21,074.64x = 31,611.92 × 8,591.92
  4. Step 4: Simplify right side
    21,074.64x = 271,607,087.69
  5. Step 5: Solve for x
    x = 271,607,087.69/21,074.64
  6. Step 6: Final answer
    x = 12,887.86

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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.