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Finding the Fourth Proportional to 754.02, 1,039.64 and 641.97

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Solution

The fourth proportional to 754.02, 1,039.64 and 641.97 is: 885.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    754.02 : 1,039.64 = 641.97 : x
  2. Step 2: Convert to fraction form
    754.02/1,039.64 = 641.97/x
  3. Step 3: Cross multiply
    754.02x = 1,039.64 × 641.97
  4. Step 4: Simplify right side
    754.02x = 667,414.48
  5. Step 5: Solve for x
    x = 667,414.48/754.02
  6. Step 6: Final answer
    x = 885.14

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.