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Finding the Fourth Proportional to 2,057.96, 3,085.98 and 689

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Solution

The fourth proportional to 2,057.96, 3,085.98 and 689 is: 1,033.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,057.96 : 3,085.98 = 689 : x
  2. Step 2: Convert to fraction form
    2,057.96/3,085.98 = 689/x
  3. Step 3: Cross multiply
    2,057.96x = 3,085.98 × 689
  4. Step 4: Simplify right side
    2,057.96x = 2,126,240.22
  5. Step 5: Solve for x
    x = 2,126,240.22/2,057.96
  6. Step 6: Final answer
    x = 1,033.18

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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.