Home / 3,131.40-4,691.70-1,975.80

Finding the Fourth Proportional to 3,131.40, 4,691.70 and 1,975.80

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Solution

The fourth proportional to 3,131.40, 4,691.70 and 1,975.80 is: 2,960.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.40 : 4,691.70 = 1,975.80 : x
  2. Step 2: Convert to fraction form
    3,131.40/4,691.70 = 1,975.80/x
  3. Step 3: Cross multiply
    3,131.40x = 4,691.70 × 1,975.80
  4. Step 4: Simplify right side
    3,131.40x = 9,269,860.86
  5. Step 5: Solve for x
    x = 9,269,860.86/3,131.40
  6. Step 6: Final answer
    x = 2,960.29

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.