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Finding the Fourth Proportional to 2,138.76, 3,207.81 and 677.72

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Solution

The fourth proportional to 2,138.76, 3,207.81 and 677.72 is: 1,016.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,138.76 : 3,207.81 = 677.72 : x
  2. Step 2: Convert to fraction form
    2,138.76/3,207.81 = 677.72/x
  3. Step 3: Cross multiply
    2,138.76x = 3,207.81 × 677.72
  4. Step 4: Simplify right side
    2,138.76x = 2,174,005.01
  5. Step 5: Solve for x
    x = 2,174,005.01/2,138.76
  6. Step 6: Final answer
    x = 1,016.48

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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.