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Finding the Fourth Proportional to 620.29, 855.96 and 354.76

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Solution

The fourth proportional to 620.29, 855.96 and 354.76 is: 489.55

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.29 : 855.96 = 354.76 : x
  2. Step 2: Convert to fraction form
    620.29/855.96 = 354.76/x
  3. Step 3: Cross multiply
    620.29x = 855.96 × 354.76
  4. Step 4: Simplify right side
    620.29x = 303,660.37
  5. Step 5: Solve for x
    x = 303,660.37/620.29
  6. Step 6: Final answer
    x = 489.55

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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.