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Finding the Fourth Proportional to 722.74, 997.38 and 391.17

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Solution

The fourth proportional to 722.74, 997.38 and 391.17 is: 539.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.74 : 997.38 = 391.17 : x
  2. Step 2: Convert to fraction form
    722.74/997.38 = 391.17/x
  3. Step 3: Cross multiply
    722.74x = 997.38 × 391.17
  4. Step 4: Simplify right side
    722.74x = 390,147.72
  5. Step 5: Solve for x
    x = 390,147.72/722.74
  6. Step 6: Final answer
    x = 539.82

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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.