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Finding the Fourth Proportional to 3,326.20, 4,989.26 and 861

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Solution

The fourth proportional to 3,326.20, 4,989.26 and 861 is: 1,291.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,326.20 : 4,989.26 = 861 : x
  2. Step 2: Convert to fraction form
    3,326.20/4,989.26 = 861/x
  3. Step 3: Cross multiply
    3,326.20x = 4,989.26 × 861
  4. Step 4: Simplify right side
    3,326.20x = 4,295,752.86
  5. Step 5: Solve for x
    x = 4,295,752.86/3,326.20
  6. Step 6: Final answer
    x = 1,291.49

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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.