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Finding the Fourth Proportional to 21,940.60, 32,910.90 and 20,847.10

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Solution

The fourth proportional to 21,940.60, 32,910.90 and 20,847.10 is: 31,270.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,940.60 : 32,910.90 = 20,847.10 : x
  2. Step 2: Convert to fraction form
    21,940.60/32,910.90 = 20,847.10/x
  3. Step 3: Cross multiply
    21,940.60x = 32,910.90 × 20,847.10
  4. Step 4: Simplify right side
    21,940.60x = 686,096,823.39
  5. Step 5: Solve for x
    x = 686,096,823.39/21,940.60
  6. Step 6: Final answer
    x = 31,270.65

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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.