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Finding the Fourth Proportional to 21,992.80, 32,912.40 and 20,149.60

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Solution

The fourth proportional to 21,992.80, 32,912.40 and 20,149.60 is: 30,154.04

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,992.80 : 32,912.40 = 20,149.60 : x
  2. Step 2: Convert to fraction form
    21,992.80/32,912.40 = 20,149.60/x
  3. Step 3: Cross multiply
    21,992.80x = 32,912.40 × 20,149.60
  4. Step 4: Simplify right side
    21,992.80x = 663,171,695.04
  5. Step 5: Solve for x
    x = 663,171,695.04/21,992.80
  6. Step 6: Final answer
    x = 30,154.04

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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.