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Finding the Fourth Proportional to 620.36, 855.83 and 354.75

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Solution

The fourth proportional to 620.36, 855.83 and 354.75 is: 489.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.36 : 855.83 = 354.75 : x
  2. Step 2: Convert to fraction form
    620.36/855.83 = 354.75/x
  3. Step 3: Cross multiply
    620.36x = 855.83 × 354.75
  4. Step 4: Simplify right side
    620.36x = 303,603.37
  5. Step 5: Solve for x
    x = 303,603.37/620.36
  6. Step 6: Final answer
    x = 489.40

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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.