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Finding the Fourth Proportional to 1,107.36, 1,661.61 and 491.49

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Solution

The fourth proportional to 1,107.36, 1,661.61 and 491.49 is: 737.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.36 : 1,661.61 = 491.49 : x
  2. Step 2: Convert to fraction form
    1,107.36/1,661.61 = 491.49/x
  3. Step 3: Cross multiply
    1,107.36x = 1,661.61 × 491.49
  4. Step 4: Simplify right side
    1,107.36x = 816,664.70
  5. Step 5: Solve for x
    x = 816,664.70/1,107.36
  6. Step 6: Final answer
    x = 737.49

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Half scale
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Double scale
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1.5x scale

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.