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Finding the Fourth Proportional to 2,072.30, 3,108.87 and 685.70

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Solution

The fourth proportional to 2,072.30, 3,108.87 and 685.70 is: 1,028.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,072.30 : 3,108.87 = 685.70 : x
  2. Step 2: Convert to fraction form
    2,072.30/3,108.87 = 685.70/x
  3. Step 3: Cross multiply
    2,072.30x = 3,108.87 × 685.70
  4. Step 4: Simplify right side
    2,072.30x = 2,131,752.16
  5. Step 5: Solve for x
    x = 2,131,752.16/2,072.30
  6. Step 6: Final answer
    x = 1,028.69

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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.