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Finding the Fourth Proportional to 755.58, 1,135.20 and 664.44

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Solution

The fourth proportional to 755.58, 1,135.20 and 664.44 is: 998.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    755.58 : 1,135.20 = 664.44 : x
  2. Step 2: Convert to fraction form
    755.58/1,135.20 = 664.44/x
  3. Step 3: Cross multiply
    755.58x = 1,135.20 × 664.44
  4. Step 4: Simplify right side
    755.58x = 754,272.29
  5. Step 5: Solve for x
    x = 754,272.29/755.58
  6. Step 6: Final answer
    x = 998.27

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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.