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Finding the Fourth Proportional to 1,080.35, 1,491.26 and 660.99

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Solution

The fourth proportional to 1,080.35, 1,491.26 and 660.99 is: 912.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.35 : 1,491.26 = 660.99 : x
  2. Step 2: Convert to fraction form
    1,080.35/1,491.26 = 660.99/x
  3. Step 3: Cross multiply
    1,080.35x = 1,491.26 × 660.99
  4. Step 4: Simplify right side
    1,080.35x = 985,704.64
  5. Step 5: Solve for x
    x = 985,704.64/1,080.35
  6. Step 6: Final answer
    x = 912.40

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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.