Home / 2,138.77-3,209.37-1,319.05

Finding the Fourth Proportional to 2,138.77, 3,209.37 and 1,319.05

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Solution

The fourth proportional to 2,138.77, 3,209.37 and 1,319.05 is: 1,979.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.77 : 3,209.37 = 1,319.05 : x
  2. Step 2: Convert to fraction form
    2,138.77/3,209.37 = 1,319.05/x
  3. Step 3: Cross multiply
    2,138.77x = 3,209.37 × 1,319.05
  4. Step 4: Simplify right side
    2,138.77x = 4,233,319.50
  5. Step 5: Solve for x
    x = 4,233,319.50/2,138.77
  6. Step 6: Final answer
    x = 1,979.32

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1.5x scale

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.