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Finding the Fourth Proportional to 620.62, 855.07 and 520.65

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Solution

The fourth proportional to 620.62, 855.07 and 520.65 is: 717.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    620.62 : 855.07 = 520.65 : x
  2. Step 2: Convert to fraction form
    620.62/855.07 = 520.65/x
  3. Step 3: Cross multiply
    620.62x = 855.07 × 520.65
  4. Step 4: Simplify right side
    620.62x = 445,192.20
  5. Step 5: Solve for x
    x = 445,192.20/620.62
  6. Step 6: Final answer
    x = 717.33

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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.