Home / 21,091.91-31,621.97-12,769.92

Finding the Fourth Proportional to 21,091.91, 31,621.97 and 12,769.92

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Solution

The fourth proportional to 21,091.91, 31,621.97 and 12,769.92 is: 19,145.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,091.91 : 31,621.97 = 12,769.92 : x
  2. Step 2: Convert to fraction form
    21,091.91/31,621.97 = 12,769.92/x
  3. Step 3: Cross multiply
    21,091.91x = 31,621.97 × 12,769.92
  4. Step 4: Simplify right side
    21,091.91x = 403,809,889.75
  5. Step 5: Solve for x
    x = 403,809,889.75/21,091.91
  6. Step 6: Final answer
    x = 19,145.25

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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.