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Finding the Fourth Proportional to 21,939.96, 32,912.62 and 7,144.90

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Solution

The fourth proportional to 21,939.96, 32,912.62 and 7,144.90 is: 10,718.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.96 : 32,912.62 = 7,144.90 : x
  2. Step 2: Convert to fraction form
    21,939.96/32,912.62 = 7,144.90/x
  3. Step 3: Cross multiply
    21,939.96x = 32,912.62 × 7,144.90
  4. Step 4: Simplify right side
    21,939.96x = 235,157,378.64
  5. Step 5: Solve for x
    x = 235,157,378.64/21,939.96
  6. Step 6: Final answer
    x = 10,718.22

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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.