Home / 2,809.60-3,876.87-1,690.81

Finding the Fourth Proportional to 2,809.60, 3,876.87 and 1,690.81

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Solution

The fourth proportional to 2,809.60, 3,876.87 and 1,690.81 is: 2,333.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,809.60 : 3,876.87 = 1,690.81 : x
  2. Step 2: Convert to fraction form
    2,809.60/3,876.87 = 1,690.81/x
  3. Step 3: Cross multiply
    2,809.60x = 3,876.87 × 1,690.81
  4. Step 4: Simplify right side
    2,809.60x = 6,555,047.21
  5. Step 5: Solve for x
    x = 6,555,047.21/2,809.60
  6. Step 6: Final answer
    x = 2,333.09

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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.