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Finding the Fourth Proportional to 723.19, 998.21 and 428.56

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Solution

The fourth proportional to 723.19, 998.21 and 428.56 is: 591.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    723.19 : 998.21 = 428.56 : x
  2. Step 2: Convert to fraction form
    723.19/998.21 = 428.56/x
  3. Step 3: Cross multiply
    723.19x = 998.21 × 428.56
  4. Step 4: Simplify right side
    723.19x = 427,792.88
  5. Step 5: Solve for x
    x = 427,792.88/723.19
  6. Step 6: Final answer
    x = 591.54

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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.