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Finding the Fourth Proportional to 1,107.46, 1,661.19 and 559.09

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Solution

The fourth proportional to 1,107.46, 1,661.19 and 559.09 is: 838.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,107.46 : 1,661.19 = 559.09 : x
  2. Step 2: Convert to fraction form
    1,107.46/1,661.19 = 559.09/x
  3. Step 3: Cross multiply
    1,107.46x = 1,661.19 × 559.09
  4. Step 4: Simplify right side
    1,107.46x = 928,754.72
  5. Step 5: Solve for x
    x = 928,754.72/1,107.46
  6. Step 6: Final answer
    x = 838.64

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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.