Home / 7,810.75-11,720.67-3,131.20

Finding the Fourth Proportional to 7,810.75, 11,720.67 and 3,131.20

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Solution

The fourth proportional to 7,810.75, 11,720.67 and 3,131.20 is: 4,698.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,810.75 : 11,720.67 = 3,131.20 : x
  2. Step 2: Convert to fraction form
    7,810.75/11,720.67 = 3,131.20/x
  3. Step 3: Cross multiply
    7,810.75x = 11,720.67 × 3,131.20
  4. Step 4: Simplify right side
    7,810.75x = 36,699,761.90
  5. Step 5: Solve for x
    x = 36,699,761.90/7,810.75
  6. Step 6: Final answer
    x = 4,698.62

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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.