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Finding the Fourth Proportional to 2,139.77, 3,207.60 and 677.92

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Solution

The fourth proportional to 2,139.77, 3,207.60 and 677.92 is: 1,016.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,139.77 : 3,207.60 = 677.92 : x
  2. Step 2: Convert to fraction form
    2,139.77/3,207.60 = 677.92/x
  3. Step 3: Cross multiply
    2,139.77x = 3,207.60 × 677.92
  4. Step 4: Simplify right side
    2,139.77x = 2,174,496.19
  5. Step 5: Solve for x
    x = 2,174,496.19/2,139.77
  6. Step 6: Final answer
    x = 1,016.23

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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.