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Finding the Fourth Proportional to 619.72, 855.74 and 443.23

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Solution

The fourth proportional to 619.72, 855.74 and 443.23 is: 612.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.72 : 855.74 = 443.23 : x
  2. Step 2: Convert to fraction form
    619.72/855.74 = 443.23/x
  3. Step 3: Cross multiply
    619.72x = 855.74 × 443.23
  4. Step 4: Simplify right side
    619.72x = 379,285.28
  5. Step 5: Solve for x
    x = 379,285.28/619.72
  6. Step 6: Final answer
    x = 612.03

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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.