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Finding the Fourth Proportional to 2,158.86, 3,238.65 and 677.79

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Solution

The fourth proportional to 2,158.86, 3,238.65 and 677.79 is: 1,016.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,158.86 : 3,238.65 = 677.79 : x
  2. Step 2: Convert to fraction form
    2,158.86/3,238.65 = 677.79/x
  3. Step 3: Cross multiply
    2,158.86x = 3,238.65 × 677.79
  4. Step 4: Simplify right side
    2,158.86x = 2,195,124.58
  5. Step 5: Solve for x
    x = 2,195,124.58/2,158.86
  6. Step 6: Final answer
    x = 1,016.80

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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.