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Finding the Fourth Proportional to 413.88, 621.44 and 231.64

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Solution

The fourth proportional to 413.88, 621.44 and 231.64 is: 347.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.88 : 621.44 = 231.64 : x
  2. Step 2: Convert to fraction form
    413.88/621.44 = 231.64/x
  3. Step 3: Cross multiply
    413.88x = 621.44 × 231.64
  4. Step 4: Simplify right side
    413.88x = 143,950.36
  5. Step 5: Solve for x
    x = 143,950.36/413.88
  6. Step 6: Final answer
    x = 347.81

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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.