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Finding the Fourth Proportional to 1,100.80, 1,651.20 and 668.80

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Solution

The fourth proportional to 1,100.80, 1,651.20 and 668.80 is: 1,003.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,100.80 : 1,651.20 = 668.80 : x
  2. Step 2: Convert to fraction form
    1,100.80/1,651.20 = 668.80/x
  3. Step 3: Cross multiply
    1,100.80x = 1,651.20 × 668.80
  4. Step 4: Simplify right side
    1,100.80x = 1,104,322.56
  5. Step 5: Solve for x
    x = 1,104,322.56/1,100.80
  6. Step 6: Final answer
    x = 1,003.20

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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.