Home / 3,131.92-4,320.80-2,135.60

Finding the Fourth Proportional to 3,131.92, 4,320.80 and 2,135.60

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Solution

The fourth proportional to 3,131.92, 4,320.80 and 2,135.60 is: 2,946.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,131.92 : 4,320.80 = 2,135.60 : x
  2. Step 2: Convert to fraction form
    3,131.92/4,320.80 = 2,135.60/x
  3. Step 3: Cross multiply
    3,131.92x = 4,320.80 × 2,135.60
  4. Step 4: Simplify right side
    3,131.92x = 9,227,500.48
  5. Step 5: Solve for x
    x = 9,227,500.48/3,131.92
  6. Step 6: Final answer
    x = 2,946.28

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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.