Home / 2,072.10-3,108.21-685.51

Finding the Fourth Proportional to 2,072.10, 3,108.21 and 685.51

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Solution

The fourth proportional to 2,072.10, 3,108.21 and 685.51 is: 1,028.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,072.10 : 3,108.21 = 685.51 : x
  2. Step 2: Convert to fraction form
    2,072.10/3,108.21 = 685.51/x
  3. Step 3: Cross multiply
    2,072.10x = 3,108.21 × 685.51
  4. Step 4: Simplify right side
    2,072.10x = 2,130,709.04
  5. Step 5: Solve for x
    x = 2,130,709.04/2,072.10
  6. Step 6: Final answer
    x = 1,028.29

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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.