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Finding the Fourth Proportional to 2,100.97, 3,151.22 and 640.13

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Solution

The fourth proportional to 2,100.97, 3,151.22 and 640.13 is: 960.13

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.97 : 3,151.22 = 640.13 : x
  2. Step 2: Convert to fraction form
    2,100.97/3,151.22 = 640.13/x
  3. Step 3: Cross multiply
    2,100.97x = 3,151.22 × 640.13
  4. Step 4: Simplify right side
    2,100.97x = 2,017,190.46
  5. Step 5: Solve for x
    x = 2,017,190.46/2,100.97
  6. Step 6: Final answer
    x = 960.13

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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.