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Finding the Fourth Proportional to 1,107.58, 1,661.36 and 491.56

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Solution

The fourth proportional to 1,107.58, 1,661.36 and 491.56 is: 737.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.58 : 1,661.36 = 491.56 : x
  2. Step 2: Convert to fraction form
    1,107.58/1,661.36 = 491.56/x
  3. Step 3: Cross multiply
    1,107.58x = 1,661.36 × 491.56
  4. Step 4: Simplify right side
    1,107.58x = 816,658.12
  5. Step 5: Solve for x
    x = 816,658.12/1,107.58
  6. Step 6: Final answer
    x = 737.34

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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.