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Finding the Fourth Proportional to 1,180.25, 1,770.60 and 660.99

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Solution

The fourth proportional to 1,180.25, 1,770.60 and 660.99 is: 991.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,180.25 : 1,770.60 = 660.99 : x
  2. Step 2: Convert to fraction form
    1,180.25/1,770.60 = 660.99/x
  3. Step 3: Cross multiply
    1,180.25x = 1,770.60 × 660.99
  4. Step 4: Simplify right side
    1,180.25x = 1,170,348.89
  5. Step 5: Solve for x
    x = 1,170,348.89/1,180.25
  6. Step 6: Final answer
    x = 991.61

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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.