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Finding the Fourth Proportional to 620.01, 855.88 and 396.25

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Solution

The fourth proportional to 620.01, 855.88 and 396.25 is: 546.99

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.01 : 855.88 = 396.25 : x
  2. Step 2: Convert to fraction form
    620.01/855.88 = 396.25/x
  3. Step 3: Cross multiply
    620.01x = 855.88 × 396.25
  4. Step 4: Simplify right side
    620.01x = 339,139.32
  5. Step 5: Solve for x
    x = 339,139.32/620.01
  6. Step 6: Final answer
    x = 546.99

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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.