Home / 21,207.92-31,811.72-11,719.76

Finding the Fourth Proportional to 21,207.92, 31,811.72 and 11,719.76

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Solution

The fourth proportional to 21,207.92, 31,811.72 and 11,719.76 is: 17,579.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,207.92 : 31,811.72 = 11,719.76 : x
  2. Step 2: Convert to fraction form
    21,207.92/31,811.72 = 11,719.76/x
  3. Step 3: Cross multiply
    21,207.92x = 31,811.72 × 11,719.76
  4. Step 4: Simplify right side
    21,207.92x = 372,825,723.59
  5. Step 5: Solve for x
    x = 372,825,723.59/21,207.92
  6. Step 6: Final answer
    x = 17,579.55

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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.