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Finding the Fourth Proportional to 753.54, 1,039.90 and 422

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Solution

The fourth proportional to 753.54, 1,039.90 and 422 is: 582.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.54 : 1,039.90 = 422 : x
  2. Step 2: Convert to fraction form
    753.54/1,039.90 = 422/x
  3. Step 3: Cross multiply
    753.54x = 1,039.90 × 422
  4. Step 4: Simplify right side
    753.54x = 438,837.80
  5. Step 5: Solve for x
    x = 438,837.80/753.54
  6. Step 6: Final answer
    x = 582.37

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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.