Home / 2,100.49-3,151.20-639.75

Finding the Fourth Proportional to 2,100.49, 3,151.20 and 639.75

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Solution

The fourth proportional to 2,100.49, 3,151.20 and 639.75 is: 959.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.49 : 3,151.20 = 639.75 : x
  2. Step 2: Convert to fraction form
    2,100.49/3,151.20 = 639.75/x
  3. Step 3: Cross multiply
    2,100.49x = 3,151.20 × 639.75
  4. Step 4: Simplify right side
    2,100.49x = 2,015,977.00
  5. Step 5: Solve for x
    x = 2,015,977.00/2,100.49
  6. Step 6: Final answer
    x = 959.77

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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.