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Finding the Fourth Proportional to 1,128.03, 1,689.93 and 664.44

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Solution

The fourth proportional to 1,128.03, 1,689.93 and 664.44 is: 995.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,128.03 : 1,689.93 = 664.44 : x
  2. Step 2: Convert to fraction form
    1,128.03/1,689.93 = 664.44/x
  3. Step 3: Cross multiply
    1,128.03x = 1,689.93 × 664.44
  4. Step 4: Simplify right side
    1,128.03x = 1,122,850.75
  5. Step 5: Solve for x
    x = 1,122,850.75/1,128.03
  6. Step 6: Final answer
    x = 995.41

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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.