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Finding the Fourth Proportional to 21,939.40, 32,917.20 and 21,129.40

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Solution

The fourth proportional to 21,939.40, 32,917.20 and 21,129.40 is: 31,701.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,939.40 : 32,917.20 = 21,129.40 : x
  2. Step 2: Convert to fraction form
    21,939.40/32,917.20 = 21,129.40/x
  3. Step 3: Cross multiply
    21,939.40x = 32,917.20 × 21,129.40
  4. Step 4: Simplify right side
    21,939.40x = 695,520,685.68
  5. Step 5: Solve for x
    x = 695,520,685.68/21,939.40
  6. Step 6: Final answer
    x = 31,701.90

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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.