Home / 20,811.75-31,220.73-7,663.11

Finding the Fourth Proportional to 20,811.75, 31,220.73 and 7,663.11

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Solution

The fourth proportional to 20,811.75, 31,220.73 and 7,663.11 is: 11,495.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,811.75 : 31,220.73 = 7,663.11 : x
  2. Step 2: Convert to fraction form
    20,811.75/31,220.73 = 7,663.11/x
  3. Step 3: Cross multiply
    20,811.75x = 31,220.73 × 7,663.11
  4. Step 4: Simplify right side
    20,811.75x = 239,247,888.27
  5. Step 5: Solve for x
    x = 239,247,888.27/20,811.75
  6. Step 6: Final answer
    x = 11,495.81

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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.