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Finding the Fourth Proportional to 1,080.44, 1,490.64 and 660.68

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Solution

The fourth proportional to 1,080.44, 1,490.64 and 660.68 is: 911.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.44 : 1,490.64 = 660.68 : x
  2. Step 2: Convert to fraction form
    1,080.44/1,490.64 = 660.68/x
  3. Step 3: Cross multiply
    1,080.44x = 1,490.64 × 660.68
  4. Step 4: Simplify right side
    1,080.44x = 984,836.04
  5. Step 5: Solve for x
    x = 984,836.04/1,080.44
  6. Step 6: Final answer
    x = 911.51

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.