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Finding the Fourth Proportional to 413.75, 620.78 and 231.30

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Solution

The fourth proportional to 413.75, 620.78 and 231.30 is: 347.03

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.75 : 620.78 = 231.30 : x
  2. Step 2: Convert to fraction form
    413.75/620.78 = 231.30/x
  3. Step 3: Cross multiply
    413.75x = 620.78 × 231.30
  4. Step 4: Simplify right side
    413.75x = 143,585.26
  5. Step 5: Solve for x
    x = 143,585.26/413.75
  6. Step 6: Final answer
    x = 347.03

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.