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Finding the Fourth Proportional to 1,080.21, 1,490.31 and 660.43

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Solution

The fourth proportional to 1,080.21, 1,490.31 and 660.43 is: 911.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.21 : 1,490.31 = 660.43 : x
  2. Step 2: Convert to fraction form
    1,080.21/1,490.31 = 660.43/x
  3. Step 3: Cross multiply
    1,080.21x = 1,490.31 × 660.43
  4. Step 4: Simplify right side
    1,080.21x = 984,245.43
  5. Step 5: Solve for x
    x = 984,245.43/1,080.21
  6. Step 6: Final answer
    x = 911.16

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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.