Home / 2,100.36-3,151.08-639.68

Finding the Fourth Proportional to 2,100.36, 3,151.08 and 639.68

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Solution

The fourth proportional to 2,100.36, 3,151.08 and 639.68 is: 959.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.36 : 3,151.08 = 639.68 : x
  2. Step 2: Convert to fraction form
    2,100.36/3,151.08 = 639.68/x
  3. Step 3: Cross multiply
    2,100.36x = 3,151.08 × 639.68
  4. Step 4: Simplify right side
    2,100.36x = 2,015,682.85
  5. Step 5: Solve for x
    x = 2,015,682.85/2,100.36
  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.