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Finding the Fourth Proportional to 722.81, 997.41 and 428.03

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Solution

The fourth proportional to 722.81, 997.41 and 428.03 is: 590.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    722.81 : 997.41 = 428.03 : x
  2. Step 2: Convert to fraction form
    722.81/997.41 = 428.03/x
  3. Step 3: Cross multiply
    722.81x = 997.41 × 428.03
  4. Step 4: Simplify right side
    722.81x = 426,921.40
  5. Step 5: Solve for x
    x = 426,921.40/722.81
  6. Step 6: Final answer
    x = 590.64

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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.