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Finding the Fourth Proportional to 1,391.75, 2,089.67 and 661.85

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Solution

The fourth proportional to 1,391.75, 2,089.67 and 661.85 is: 993.74

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.75 : 2,089.67 = 661.85 : x
  2. Step 2: Convert to fraction form
    1,391.75/2,089.67 = 661.85/x
  3. Step 3: Cross multiply
    1,391.75x = 2,089.67 × 661.85
  4. Step 4: Simplify right side
    1,391.75x = 1,383,034.33
  5. Step 5: Solve for x
    x = 1,383,034.33/1,391.75
  6. Step 6: Final answer
    x = 993.74

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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.