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Finding the Fourth Proportional to 722.31, 1,083.97 and 393.91

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Solution

The fourth proportional to 722.31, 1,083.97 and 393.91 is: 591.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.31 : 1,083.97 = 393.91 : x
  2. Step 2: Convert to fraction form
    722.31/1,083.97 = 393.91/x
  3. Step 3: Cross multiply
    722.31x = 1,083.97 × 393.91
  4. Step 4: Simplify right side
    722.31x = 426,986.62
  5. Step 5: Solve for x
    x = 426,986.62/722.31
  6. Step 6: Final answer
    x = 591.14

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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.