Home / 1,311.11-1,809.30-721.64

Finding the Fourth Proportional to 1,311.11, 1,809.30 and 721.64

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Solution

The fourth proportional to 1,311.11, 1,809.30 and 721.64 is: 995.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,311.11 : 1,809.30 = 721.64 : x
  2. Step 2: Convert to fraction form
    1,311.11/1,809.30 = 721.64/x
  3. Step 3: Cross multiply
    1,311.11x = 1,809.30 × 721.64
  4. Step 4: Simplify right side
    1,311.11x = 1,305,663.25
  5. Step 5: Solve for x
    x = 1,305,663.25/1,311.11
  6. Step 6: Final answer
    x = 995.85

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1.5x scale

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.