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Finding the Fourth Proportional to 1,336.70, 2,008.60 and 720.85

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Solution

The fourth proportional to 1,336.70, 2,008.60 and 720.85 is: 1,083.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,336.70 : 2,008.60 = 720.85 : x
  2. Step 2: Convert to fraction form
    1,336.70/2,008.60 = 720.85/x
  3. Step 3: Cross multiply
    1,336.70x = 2,008.60 × 720.85
  4. Step 4: Simplify right side
    1,336.70x = 1,447,896.25
  5. Step 5: Solve for x
    x = 1,447,896.25/1,336.70
  6. Step 6: Final answer
    x = 1,083.19

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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.