Home / 7,131.12-9,839.40-3,987.20

Finding the Fourth Proportional to 7,131.12, 9,839.40 and 3,987.20

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Solution

The fourth proportional to 7,131.12, 9,839.40 and 3,987.20 is: 5,501.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131.12 : 9,839.40 = 3,987.20 : x
  2. Step 2: Convert to fraction form
    7,131.12/9,839.40 = 3,987.20/x
  3. Step 3: Cross multiply
    7,131.12x = 9,839.40 × 3,987.20
  4. Step 4: Simplify right side
    7,131.12x = 39,231,655.68
  5. Step 5: Solve for x
    x = 39,231,655.68/7,131.12
  6. Step 6: Final answer
    x = 5,501.47

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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.