Home / 20,722.13-31,083.04-5,139.75

Finding the Fourth Proportional to 20,722.13, 31,083.04 and 5,139.75

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Solution

The fourth proportional to 20,722.13, 31,083.04 and 5,139.75 is: 7,709.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,722.13 : 31,083.04 = 5,139.75 : x
  2. Step 2: Convert to fraction form
    20,722.13/31,083.04 = 5,139.75/x
  3. Step 3: Cross multiply
    20,722.13x = 31,083.04 × 5,139.75
  4. Step 4: Simplify right side
    20,722.13x = 159,759,177.83
  5. Step 5: Solve for x
    x = 159,759,177.83/20,722.13
  6. Step 6: Final answer
    x = 7,709.59

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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.