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Finding the Fourth Proportional to 21,785.82, 32,661.12 and 8,451.92

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Solution

The fourth proportional to 21,785.82, 32,661.12 and 8,451.92 is: 12,671.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,785.82 : 32,661.12 = 8,451.92 : x
  2. Step 2: Convert to fraction form
    21,785.82/32,661.12 = 8,451.92/x
  3. Step 3: Cross multiply
    21,785.82x = 32,661.12 × 8,451.92
  4. Step 4: Simplify right side
    21,785.82x = 276,049,173.35
  5. Step 5: Solve for x
    x = 276,049,173.35/21,785.82
  6. Step 6: Final answer
    x = 12,671.05

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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.