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Finding the Fourth Proportional to 619.98, 855.74 and 354.55

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Solution

The fourth proportional to 619.98, 855.74 and 354.55 is: 489.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.98 : 855.74 = 354.55 : x
  2. Step 2: Convert to fraction form
    619.98/855.74 = 354.55/x
  3. Step 3: Cross multiply
    619.98x = 855.74 × 354.55
  4. Step 4: Simplify right side
    619.98x = 303,404.38
  5. Step 5: Solve for x
    x = 303,404.38/619.98
  6. Step 6: Final answer
    x = 489.38

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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.