Home / 13,687.38-18,888.59-7,399.75

Finding the Fourth Proportional to 13,687.38, 18,888.59 and 7,399.75

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Solution

The fourth proportional to 13,687.38, 18,888.59 and 7,399.75 is: 10,211.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,687.38 : 18,888.59 = 7,399.75 : x
  2. Step 2: Convert to fraction form
    13,687.38/18,888.59 = 7,399.75/x
  3. Step 3: Cross multiply
    13,687.38x = 18,888.59 × 7,399.75
  4. Step 4: Simplify right side
    13,687.38x = 139,770,843.85
  5. Step 5: Solve for x
    x = 139,770,843.85/13,687.38
  6. Step 6: Final answer
    x = 10,211.66

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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.