Home / 3,131.80-4,321.91-1,715.45

Finding the Fourth Proportional to 3,131.80, 4,321.91 and 1,715.45

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Solution

The fourth proportional to 3,131.80, 4,321.91 and 1,715.45 is: 2,367.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.80 : 4,321.91 = 1,715.45 : x
  2. Step 2: Convert to fraction form
    3,131.80/4,321.91 = 1,715.45/x
  3. Step 3: Cross multiply
    3,131.80x = 4,321.91 × 1,715.45
  4. Step 4: Simplify right side
    3,131.80x = 7,414,003.19
  5. Step 5: Solve for x
    x = 7,414,003.19/3,131.80
  6. Step 6: Final answer
    x = 2,367.33

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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.