Home / 20,920.82-31,356.86-7,764.80

Finding the Fourth Proportional to 20,920.82, 31,356.86 and 7,764.80

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Solution

The fourth proportional to 20,920.82, 31,356.86 and 7,764.80 is: 11,638.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,920.82 : 31,356.86 = 7,764.80 : x
  2. Step 2: Convert to fraction form
    20,920.82/31,356.86 = 7,764.80/x
  3. Step 3: Cross multiply
    20,920.82x = 31,356.86 × 7,764.80
  4. Step 4: Simplify right side
    20,920.82x = 243,479,550.92
  5. Step 5: Solve for x
    x = 243,479,550.92/20,920.82
  6. Step 6: Final answer
    x = 11,638.15

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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.