Home / 2,138.54-3,190.25-1,989.39

Finding the Fourth Proportional to 2,138.54, 3,190.25 and 1,989.39

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Solution

The fourth proportional to 2,138.54, 3,190.25 and 1,989.39 is: 2,967.75

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.54 : 3,190.25 = 1,989.39 : x
  2. Step 2: Convert to fraction form
    2,138.54/3,190.25 = 1,989.39/x
  3. Step 3: Cross multiply
    2,138.54x = 3,190.25 × 1,989.39
  4. Step 4: Simplify right side
    2,138.54x = 6,346,641.50
  5. Step 5: Solve for x
    x = 6,346,641.50/2,138.54
  6. Step 6: Final answer
    x = 2,967.75

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.