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Finding the Fourth Proportional to 722.54, 997.11 and 390.97

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Solution

The fourth proportional to 722.54, 997.11 and 390.97 is: 539.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.54 : 997.11 = 390.97 : x
  2. Step 2: Convert to fraction form
    722.54/997.11 = 390.97/x
  3. Step 3: Cross multiply
    722.54x = 997.11 × 390.97
  4. Step 4: Simplify right side
    722.54x = 389,833.16
  5. Step 5: Solve for x
    x = 389,833.16/722.54
  6. Step 6: Final answer
    x = 539.53

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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.