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Finding the Fourth Proportional to 1,107.91, 1,661.77 and 414.25

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Solution

The fourth proportional to 1,107.91, 1,661.77 and 414.25 is: 621.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.91 : 1,661.77 = 414.25 : x
  2. Step 2: Convert to fraction form
    1,107.91/1,661.77 = 414.25/x
  3. Step 3: Cross multiply
    1,107.91x = 1,661.77 × 414.25
  4. Step 4: Simplify right side
    1,107.91x = 688,388.22
  5. Step 5: Solve for x
    x = 688,388.22/1,107.91
  6. Step 6: Final answer
    x = 621.34

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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.