Home / 21,128.07-31,723.25-11,786.34

Finding the Fourth Proportional to 21,128.07, 31,723.25 and 11,786.34

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Solution

The fourth proportional to 21,128.07, 31,723.25 and 11,786.34 is: 17,696.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,128.07 : 31,723.25 = 11,786.34 : x
  2. Step 2: Convert to fraction form
    21,128.07/31,723.25 = 11,786.34/x
  3. Step 3: Cross multiply
    21,128.07x = 31,723.25 × 11,786.34
  4. Step 4: Simplify right side
    21,128.07x = 373,901,010.41
  5. Step 5: Solve for x
    x = 373,901,010.41/21,128.07
  6. Step 6: Final answer
    x = 17,696.88

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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.