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Finding the Fourth Proportional to 413.73, 621.99 and 391.41

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Solution

The fourth proportional to 413.73, 621.99 and 391.41 is: 588.43

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.73 : 621.99 = 391.41 : x
  2. Step 2: Convert to fraction form
    413.73/621.99 = 391.41/x
  3. Step 3: Cross multiply
    413.73x = 621.99 × 391.41
  4. Step 4: Simplify right side
    413.73x = 243,453.11
  5. Step 5: Solve for x
    x = 243,453.11/413.73
  6. Step 6: Final answer
    x = 588.43

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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.