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Finding the Fourth Proportional to 1,205.87, 1,664.39 and 682.20

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Solution

The fourth proportional to 1,205.87, 1,664.39 and 682.20 is: 941.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,205.87 : 1,664.39 = 682.20 : x
  2. Step 2: Convert to fraction form
    1,205.87/1,664.39 = 682.20/x
  3. Step 3: Cross multiply
    1,205.87x = 1,664.39 × 682.20
  4. Step 4: Simplify right side
    1,205.87x = 1,135,448.56
  5. Step 5: Solve for x
    x = 1,135,448.56/1,205.87
  6. Step 6: Final answer
    x = 941.61

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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.