Home / 20,938.82-31,409.76-7,791.19

Finding the Fourth Proportional to 20,938.82, 31,409.76 and 7,791.19

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Solution

The fourth proportional to 20,938.82, 31,409.76 and 7,791.19 is: 11,687.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,938.82 : 31,409.76 = 7,791.19 : x
  2. Step 2: Convert to fraction form
    20,938.82/31,409.76 = 7,791.19/x
  3. Step 3: Cross multiply
    20,938.82x = 31,409.76 × 7,791.19
  4. Step 4: Simplify right side
    20,938.82x = 244,719,347.75
  5. Step 5: Solve for x
    x = 244,719,347.75/20,938.82
  6. Step 6: Final answer
    x = 11,687.35

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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.