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Finding the Fourth Proportional to 1,761.56, 2,639.60 and 665.33

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Solution

The fourth proportional to 1,761.56, 2,639.60 and 665.33 is: 996.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,761.56 : 2,639.60 = 665.33 : x
  2. Step 2: Convert to fraction form
    1,761.56/2,639.60 = 665.33/x
  3. Step 3: Cross multiply
    1,761.56x = 2,639.60 × 665.33
  4. Step 4: Simplify right side
    1,761.56x = 1,756,200.94
  5. Step 5: Solve for x
    x = 1,756,200.94/1,761.56
  6. Step 6: Final answer
    x = 996.96

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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.