Home / 7,131.12-9,840.96-3,987.36

Finding the Fourth Proportional to 7,131.12, 9,840.96 and 3,987.36

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Solution

The fourth proportional to 7,131.12, 9,840.96 and 3,987.36 is: 5,502.56

Step by Step Solution

  1. Step 1: Write the proportion equation
    7,131.12 : 9,840.96 = 3,987.36 : x
  2. Step 2: Convert to fraction form
    7,131.12/9,840.96 = 3,987.36/x
  3. Step 3: Cross multiply
    7,131.12x = 9,840.96 × 3,987.36
  4. Step 4: Simplify right side
    7,131.12x = 39,239,450.27
  5. Step 5: Solve for x
    x = 39,239,450.27/7,131.12
  6. Step 6: Final answer
    x = 5,502.56

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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.