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Finding the Fourth Proportional to 722.42, 996.79 and 427.78

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Solution

The fourth proportional to 722.42, 996.79 and 427.78 is: 590.24

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.42 : 996.79 = 427.78 : x
  2. Step 2: Convert to fraction form
    722.42/996.79 = 427.78/x
  3. Step 3: Cross multiply
    722.42x = 996.79 × 427.78
  4. Step 4: Simplify right side
    722.42x = 426,399.70
  5. Step 5: Solve for x
    x = 426,399.70/722.42
  6. Step 6: Final answer
    x = 590.24

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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.