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Finding the Fourth Proportional to 620.32, 855.86 and 354.75

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Solution

The fourth proportional to 620.32, 855.86 and 354.75 is: 489.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.32 : 855.86 = 354.75 : x
  2. Step 2: Convert to fraction form
    620.32/855.86 = 354.75/x
  3. Step 3: Cross multiply
    620.32x = 855.86 × 354.75
  4. Step 4: Simplify right side
    620.32x = 303,614.56
  5. Step 5: Solve for x
    x = 303,614.56/620.32
  6. Step 6: Final answer
    x = 489.45

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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.