Home / 3,176.80-4,381.20-2,128.80

Finding the Fourth Proportional to 3,176.80, 4,381.20 and 2,128.80

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Solution

The fourth proportional to 3,176.80, 4,381.20 and 2,128.80 is: 2,935.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,176.80 : 4,381.20 = 2,128.80 : x
  2. Step 2: Convert to fraction form
    3,176.80/4,381.20 = 2,128.80/x
  3. Step 3: Cross multiply
    3,176.80x = 4,381.20 × 2,128.80
  4. Step 4: Simplify right side
    3,176.80x = 9,326,698.56
  5. Step 5: Solve for x
    x = 9,326,698.56/3,176.80
  6. Step 6: Final answer
    x = 2,935.88

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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.