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Finding the Fourth Proportional to 3,107.70, 4,290.03 and 1,990.17

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Solution

The fourth proportional to 3,107.70, 4,290.03 and 1,990.17 is: 2,747.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,107.70 : 4,290.03 = 1,990.17 : x
  2. Step 2: Convert to fraction form
    3,107.70/4,290.03 = 1,990.17/x
  3. Step 3: Cross multiply
    3,107.70x = 4,290.03 × 1,990.17
  4. Step 4: Simplify right side
    3,107.70x = 8,537,889.01
  5. Step 5: Solve for x
    x = 8,537,889.01/3,107.70
  6. Step 6: Final answer
    x = 2,747.33

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Double scale
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.