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Finding the Fourth Proportional to 753.88, 1,040.21 and 422.31

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Solution

The fourth proportional to 753.88, 1,040.21 and 422.31 is: 582.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    753.88 : 1,040.21 = 422.31 : x
  2. Step 2: Convert to fraction form
    753.88/1,040.21 = 422.31/x
  3. Step 3: Cross multiply
    753.88x = 1,040.21 × 422.31
  4. Step 4: Simplify right side
    753.88x = 439,292.14
  5. Step 5: Solve for x
    x = 439,292.14/753.88
  6. Step 6: Final answer
    x = 582.71

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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.