Home / 3,131.70-4,321.80-1,715.36

Finding the Fourth Proportional to 3,131.70, 4,321.80 and 1,715.36

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Solution

The fourth proportional to 3,131.70, 4,321.80 and 1,715.36 is: 2,367.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.70 : 4,321.80 = 1,715.36 : x
  2. Step 2: Convert to fraction form
    3,131.70/4,321.80 = 1,715.36/x
  3. Step 3: Cross multiply
    3,131.70x = 4,321.80 × 1,715.36
  4. Step 4: Simplify right side
    3,131.70x = 7,413,440.72
  5. Step 5: Solve for x
    x = 7,413,440.72/3,131.70
  6. Step 6: Final answer
    x = 2,367.22

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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.