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Finding the Fourth Proportional to 21,939.51, 32,902.99 and 7,149.72

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Solution

The fourth proportional to 21,939.51, 32,902.99 and 7,149.72 is: 10,722.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.51 : 32,902.99 = 7,149.72 : x
  2. Step 2: Convert to fraction form
    21,939.51/32,902.99 = 7,149.72/x
  3. Step 3: Cross multiply
    21,939.51x = 32,902.99 × 7,149.72
  4. Step 4: Simplify right side
    21,939.51x = 235,247,311.39
  5. Step 5: Solve for x
    x = 235,247,311.39/21,939.51
  6. Step 6: Final answer
    x = 10,722.54

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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.