Home / 21,039.20-31,558.51-12,167.88

Finding the Fourth Proportional to 21,039.20, 31,558.51 and 12,167.88

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Solution

The fourth proportional to 21,039.20, 31,558.51 and 12,167.88 is: 18,251.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,039.20 : 31,558.51 = 12,167.88 : x
  2. Step 2: Convert to fraction form
    21,039.20/31,558.51 = 12,167.88/x
  3. Step 3: Cross multiply
    21,039.20x = 31,558.51 × 12,167.88
  4. Step 4: Simplify right side
    21,039.20x = 384,000,162.66
  5. Step 5: Solve for x
    x = 384,000,162.66/21,039.20
  6. Step 6: Final answer
    x = 18,251.65

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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.