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Finding the Fourth Proportional to 21,939.35, 32,909.06 and 7,149.42

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Solution

The fourth proportional to 21,939.35, 32,909.06 and 7,149.42 is: 10,724.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.35 : 32,909.06 = 7,149.42 : x
  2. Step 2: Convert to fraction form
    21,939.35/32,909.06 = 7,149.42/x
  3. Step 3: Cross multiply
    21,939.35x = 32,909.06 × 7,149.42
  4. Step 4: Simplify right side
    21,939.35x = 235,280,709.62
  5. Step 5: Solve for x
    x = 235,280,709.62/21,939.35
  6. Step 6: Final answer
    x = 10,724.14

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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.