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Finding the Fourth Proportional to 1,107.85, 1,661.01 and 491.22

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Solution

The fourth proportional to 1,107.85, 1,661.01 and 491.22 is: 736.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.85 : 1,661.01 = 491.22 : x
  2. Step 2: Convert to fraction form
    1,107.85/1,661.01 = 491.22/x
  3. Step 3: Cross multiply
    1,107.85x = 1,661.01 × 491.22
  4. Step 4: Simplify right side
    1,107.85x = 815,921.33
  5. Step 5: Solve for x
    x = 815,921.33/1,107.85
  6. Step 6: Final answer
    x = 736.49

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Double scale
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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.