Home / 1,336.20-2,005.38-720.36

Finding the Fourth Proportional to 1,336.20, 2,005.38 and 720.36

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Solution

The fourth proportional to 1,336.20, 2,005.38 and 720.36 is: 1,081.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,336.20 : 2,005.38 = 720.36 : x
  2. Step 2: Convert to fraction form
    1,336.20/2,005.38 = 720.36/x
  3. Step 3: Cross multiply
    1,336.20x = 2,005.38 × 720.36
  4. Step 4: Simplify right side
    1,336.20x = 1,444,595.54
  5. Step 5: Solve for x
    x = 1,444,595.54/1,336.20
  6. Step 6: Final answer
    x = 1,081.12

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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.