Home / 20,712.28-31,043.76-11,929

Finding the Fourth Proportional to 20,712.28, 31,043.76 and 11,929

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Solution

The fourth proportional to 20,712.28, 31,043.76 and 11,929 is: 17,879.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,712.28 : 31,043.76 = 11,929 : x
  2. Step 2: Convert to fraction form
    20,712.28/31,043.76 = 11,929/x
  3. Step 3: Cross multiply
    20,712.28x = 31,043.76 × 11,929
  4. Step 4: Simplify right side
    20,712.28x = 370,321,013.04
  5. Step 5: Solve for x
    x = 370,321,013.04/20,712.28
  6. Step 6: Final answer
    x = 17,879.30

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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.