Home / 2,145.10-3,213.60-1,999.30

Finding the Fourth Proportional to 2,145.10, 3,213.60 and 1,999.30

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Solution

The fourth proportional to 2,145.10, 3,213.60 and 1,999.30 is: 2,995.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,145.10 : 3,213.60 = 1,999.30 : x
  2. Step 2: Convert to fraction form
    2,145.10/3,213.60 = 1,999.30/x
  3. Step 3: Cross multiply
    2,145.10x = 3,213.60 × 1,999.30
  4. Step 4: Simplify right side
    2,145.10x = 6,424,950.48
  5. Step 5: Solve for x
    x = 6,424,950.48/2,145.10
  6. Step 6: Final answer
    x = 2,995.18

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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.