Home / 3,318.78-4,579.80-1,991.70

Finding the Fourth Proportional to 3,318.78, 4,579.80 and 1,991.70

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Solution

The fourth proportional to 3,318.78, 4,579.80 and 1,991.70 is: 2,748.48

Step by Step Solution

  1. Step 1: Write the proportion equation
    3,318.78 : 4,579.80 = 1,991.70 : x
  2. Step 2: Convert to fraction form
    3,318.78/4,579.80 = 1,991.70/x
  3. Step 3: Cross multiply
    3,318.78x = 4,579.80 × 1,991.70
  4. Step 4: Simplify right side
    3,318.78x = 9,121,587.66
  5. Step 5: Solve for x
    x = 9,121,587.66/3,318.78
  6. Step 6: Final answer
    x = 2,748.48

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.