Home / 2,100.32-3,151.08-639.58

Finding the Fourth Proportional to 2,100.32, 3,151.08 and 639.58

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Solution

The fourth proportional to 2,100.32, 3,151.08 and 639.58 is: 959.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,100.32 : 3,151.08 = 639.58 : x
  2. Step 2: Convert to fraction form
    2,100.32/3,151.08 = 639.58/x
  3. Step 3: Cross multiply
    2,100.32x = 3,151.08 × 639.58
  4. Step 4: Simplify right side
    2,100.32x = 2,015,367.75
  5. Step 5: Solve for x
    x = 2,015,367.75/2,100.32
  6. Step 6: Final answer
    x = 959.55

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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.