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Finding the Fourth Proportional to 1,107.81, 1,661.16 and 620.73

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Solution

The fourth proportional to 1,107.81, 1,661.16 and 620.73 is: 930.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.81 : 1,661.16 = 620.73 : x
  2. Step 2: Convert to fraction form
    1,107.81/1,661.16 = 620.73/x
  3. Step 3: Cross multiply
    1,107.81x = 1,661.16 × 620.73
  4. Step 4: Simplify right side
    1,107.81x = 1,031,131.85
  5. Step 5: Solve for x
    x = 1,031,131.85/1,107.81
  6. Step 6: Final answer
    x = 930.78

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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.