Home / 3,115.12-4,672.80-2,138.80

Finding the Fourth Proportional to 3,115.12, 4,672.80 and 2,138.80

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Solution

The fourth proportional to 3,115.12, 4,672.80 and 2,138.80 is: 3,208.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,115.12 : 4,672.80 = 2,138.80 : x
  2. Step 2: Convert to fraction form
    3,115.12/4,672.80 = 2,138.80/x
  3. Step 3: Cross multiply
    3,115.12x = 4,672.80 × 2,138.80
  4. Step 4: Simplify right side
    3,115.12x = 9,994,184.64
  5. Step 5: Solve for x
    x = 9,994,184.64/3,115.12
  6. Step 6: Final answer
    x = 3,208.28

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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.