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Finding the Fourth Proportional to 722.91, 997.61 and 391.33

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Solution

The fourth proportional to 722.91, 997.61 and 391.33 is: 540.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.91 : 997.61 = 391.33 : x
  2. Step 2: Convert to fraction form
    722.91/997.61 = 391.33/x
  3. Step 3: Cross multiply
    722.91x = 997.61 × 391.33
  4. Step 4: Simplify right side
    722.91x = 390,394.72
  5. Step 5: Solve for x
    x = 390,394.72/722.91
  6. Step 6: Final answer
    x = 540.03

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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.