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Finding the Fourth Proportional to 1,129.44, 1,690.05 and 667.44

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Solution

The fourth proportional to 1,129.44, 1,690.05 and 667.44 is: 998.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    1,129.44 : 1,690.05 = 667.44 : x
  2. Step 2: Convert to fraction form
    1,129.44/1,690.05 = 667.44/x
  3. Step 3: Cross multiply
    1,129.44x = 1,690.05 × 667.44
  4. Step 4: Simplify right side
    1,129.44x = 1,128,006.97
  5. Step 5: Solve for x
    x = 1,128,006.97/1,129.44
  6. Step 6: Final answer
    x = 998.73

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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.