Home / 1,081.08-1,491.40-687.96

Finding the Fourth Proportional to 1,081.08, 1,491.40 and 687.96

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Solution

The fourth proportional to 1,081.08, 1,491.40 and 687.96 is: 949.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,081.08 : 1,491.40 = 687.96 : x
  2. Step 2: Convert to fraction form
    1,081.08/1,491.40 = 687.96/x
  3. Step 3: Cross multiply
    1,081.08x = 1,491.40 × 687.96
  4. Step 4: Simplify right side
    1,081.08x = 1,026,023.54
  5. Step 5: Solve for x
    x = 1,026,023.54/1,081.08
  6. Step 6: Final answer
    x = 949.07

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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.