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Finding the Fourth Proportional to 493.44, 736.62 and 428.64

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Solution

The fourth proportional to 493.44, 736.62 and 428.64 is: 639.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    493.44 : 736.62 = 428.64 : x
  2. Step 2: Convert to fraction form
    493.44/736.62 = 428.64/x
  3. Step 3: Cross multiply
    493.44x = 736.62 × 428.64
  4. Step 4: Simplify right side
    493.44x = 315,744.80
  5. Step 5: Solve for x
    x = 315,744.80/493.44
  6. Step 6: Final answer
    x = 639.88

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Why These Related Problems?

These problems maintain the same ratio (1.49) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.