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Finding the Fourth Proportional to 1,107.39, 1,661.09 and 620.44

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Solution

The fourth proportional to 1,107.39, 1,661.09 and 620.44 is: 930.66

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.39 : 1,661.09 = 620.44 : x
  2. Step 2: Convert to fraction form
    1,107.39/1,661.09 = 620.44/x
  3. Step 3: Cross multiply
    1,107.39x = 1,661.09 × 620.44
  4. Step 4: Simplify right side
    1,107.39x = 1,030,606.68
  5. Step 5: Solve for x
    x = 1,030,606.68/1,107.39
  6. Step 6: Final answer
    x = 930.66

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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.