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Finding the Fourth Proportional to 2,608.72, 3,913.21 and 660.94

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Solution

The fourth proportional to 2,608.72, 3,913.21 and 660.94 is: 991.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    2,608.72 : 3,913.21 = 660.94 : x
  2. Step 2: Convert to fraction form
    2,608.72/3,913.21 = 660.94/x
  3. Step 3: Cross multiply
    2,608.72x = 3,913.21 × 660.94
  4. Step 4: Simplify right side
    2,608.72x = 2,586,377.45
  5. Step 5: Solve for x
    x = 2,586,377.45/2,608.72
  6. Step 6: Final answer
    x = 991.44

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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.