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Finding the Fourth Proportional to 1,391.15, 2,087.73 and 660.93

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Solution

The fourth proportional to 1,391.15, 2,087.73 and 660.93 is: 991.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,391.15 : 2,087.73 = 660.93 : x
  2. Step 2: Convert to fraction form
    1,391.15/2,087.73 = 660.93/x
  3. Step 3: Cross multiply
    1,391.15x = 2,087.73 × 660.93
  4. Step 4: Simplify right side
    1,391.15x = 1,379,843.39
  5. Step 5: Solve for x
    x = 1,379,843.39/1,391.15
  6. Step 6: Final answer
    x = 991.87

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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.