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Finding the Fourth Proportional to 753.89, 1,040.39 and 422.31

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Solution

The fourth proportional to 753.89, 1,040.39 and 422.31 is: 582.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.89 : 1,040.39 = 422.31 : x
  2. Step 2: Convert to fraction form
    753.89/1,040.39 = 422.31/x
  3. Step 3: Cross multiply
    753.89x = 1,040.39 × 422.31
  4. Step 4: Simplify right side
    753.89x = 439,372.85
  5. Step 5: Solve for x
    x = 439,372.85/753.89
  6. Step 6: Final answer
    x = 582.81

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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.