Home / 7,131.78-9,842.18-3,987.97

Finding the Fourth Proportional to 7,131.78, 9,842.18 and 3,987.97

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Solution

The fourth proportional to 7,131.78, 9,842.18 and 3,987.97 is: 5,503.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131.78 : 9,842.18 = 3,987.97 : x
  2. Step 2: Convert to fraction form
    7,131.78/9,842.18 = 3,987.97/x
  3. Step 3: Cross multiply
    7,131.78x = 9,842.18 × 3,987.97
  4. Step 4: Simplify right side
    7,131.78x = 39,250,318.57
  5. Step 5: Solve for x
    x = 39,250,318.57/7,131.78
  6. Step 6: Final answer
    x = 5,503.58

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.