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Finding the Fourth Proportional to 1,080.89, 1,622.36 and 668.78

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Solution

The fourth proportional to 1,080.89, 1,622.36 and 668.78 is: 1,003.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,080.89 : 1,622.36 = 668.78 : x
  2. Step 2: Convert to fraction form
    1,080.89/1,622.36 = 668.78/x
  3. Step 3: Cross multiply
    1,080.89x = 1,622.36 × 668.78
  4. Step 4: Simplify right side
    1,080.89x = 1,084,999.06
  5. Step 5: Solve for x
    x = 1,084,999.06/1,080.89
  6. Step 6: Final answer
    x = 1,003.80

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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.