Home / 2,142.10-3,213.15-1,907.20

Finding the Fourth Proportional to 2,142.10, 3,213.15 and 1,907.20

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Solution

The fourth proportional to 2,142.10, 3,213.15 and 1,907.20 is: 2,860.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,142.10 : 3,213.15 = 1,907.20 : x
  2. Step 2: Convert to fraction form
    2,142.10/3,213.15 = 1,907.20/x
  3. Step 3: Cross multiply
    2,142.10x = 3,213.15 × 1,907.20
  4. Step 4: Simplify right side
    2,142.10x = 6,128,119.68
  5. Step 5: Solve for x
    x = 6,128,119.68/2,142.10
  6. Step 6: Final answer
    x = 2,860.80

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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.