Home / 21,186.06-31,779-10,079.70

Finding the Fourth Proportional to 21,186.06, 31,779 and 10,079.70

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Solution

The fourth proportional to 21,186.06, 31,779 and 10,079.70 is: 15,119.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,186.06 : 31,779 = 10,079.70 : x
  2. Step 2: Convert to fraction form
    21,186.06/31,779 = 10,079.70/x
  3. Step 3: Cross multiply
    21,186.06x = 31,779 × 10,079.70
  4. Step 4: Simplify right side
    21,186.06x = 320,322,786.30
  5. Step 5: Solve for x
    x = 320,322,786.30/21,186.06
  6. Step 6: Final answer
    x = 15,119.51

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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.