Home / 3,109.12-4,290.24-2,115.66

Finding the Fourth Proportional to 3,109.12, 4,290.24 and 2,115.66

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Solution

The fourth proportional to 3,109.12, 4,290.24 and 2,115.66 is: 2,919.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,109.12 : 4,290.24 = 2,115.66 : x
  2. Step 2: Convert to fraction form
    3,109.12/4,290.24 = 2,115.66/x
  3. Step 3: Cross multiply
    3,109.12x = 4,290.24 × 2,115.66
  4. Step 4: Simplify right side
    3,109.12x = 9,076,689.16
  5. Step 5: Solve for x
    x = 9,076,689.16/3,109.12
  6. Step 6: Final answer
    x = 2,919.38

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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.