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Finding the Fourth Proportional to 722.36, 996.80 and 427.72

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Solution

The fourth proportional to 722.36, 996.80 and 427.72 is: 590.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.36 : 996.80 = 427.72 : x
  2. Step 2: Convert to fraction form
    722.36/996.80 = 427.72/x
  3. Step 3: Cross multiply
    722.36x = 996.80 × 427.72
  4. Step 4: Simplify right side
    722.36x = 426,351.30
  5. Step 5: Solve for x
    x = 426,351.30/722.36
  6. Step 6: Final answer
    x = 590.22

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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.