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Finding the Fourth Proportional to 722.20, 996.28 and 427.28

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Solution

The fourth proportional to 722.20, 996.28 and 427.28 is: 589.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.20 : 996.28 = 427.28 : x
  2. Step 2: Convert to fraction form
    722.20/996.28 = 427.28/x
  3. Step 3: Cross multiply
    722.20x = 996.28 × 427.28
  4. Step 4: Simplify right side
    722.20x = 425,690.52
  5. Step 5: Solve for x
    x = 425,690.52/722.20
  6. Step 6: Final answer
    x = 589.44

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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.