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Finding the Fourth Proportional to 2,085.99, 3,128.70 and 699.33

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Solution

The fourth proportional to 2,085.99, 3,128.70 and 699.33 is: 1,048.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,085.99 : 3,128.70 = 699.33 : x
  2. Step 2: Convert to fraction form
    2,085.99/3,128.70 = 699.33/x
  3. Step 3: Cross multiply
    2,085.99x = 3,128.70 × 699.33
  4. Step 4: Simplify right side
    2,085.99x = 2,187,993.77
  5. Step 5: Solve for x
    x = 2,187,993.77/2,085.99
  6. Step 6: Final answer
    x = 1,048.90

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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.