Home / 2,100.35-3,151.20-639.65

Finding the Fourth Proportional to 2,100.35, 3,151.20 and 639.65

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Solution

The fourth proportional to 2,100.35, 3,151.20 and 639.65 is: 959.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.35 : 3,151.20 = 639.65 : x
  2. Step 2: Convert to fraction form
    2,100.35/3,151.20 = 639.65/x
  3. Step 3: Cross multiply
    2,100.35x = 3,151.20 × 639.65
  4. Step 4: Simplify right side
    2,100.35x = 2,015,665.08
  5. Step 5: Solve for x
    x = 2,015,665.08/2,100.35
  6. Step 6: Final answer
    x = 959.68

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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.