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Finding the Fourth Proportional to 619.98, 855.63 and 354.48

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Solution

The fourth proportional to 619.98, 855.63 and 354.48 is: 489.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    619.98 : 855.63 = 354.48 : x
  2. Step 2: Convert to fraction form
    619.98/855.63 = 354.48/x
  3. Step 3: Cross multiply
    619.98x = 855.63 × 354.48
  4. Step 4: Simplify right side
    619.98x = 303,303.72
  5. Step 5: Solve for x
    x = 303,303.72/619.98
  6. Step 6: Final answer
    x = 489.22

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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.