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Finding the Fourth Proportional to 413.98, 621.05 and 140.26

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Solution

The fourth proportional to 413.98, 621.05 and 140.26 is: 210.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.98 : 621.05 = 140.26 : x
  2. Step 2: Convert to fraction form
    413.98/621.05 = 140.26/x
  3. Step 3: Cross multiply
    413.98x = 621.05 × 140.26
  4. Step 4: Simplify right side
    413.98x = 87,107.77
  5. Step 5: Solve for x
    x = 87,107.77/413.98
  6. Step 6: Final answer
    x = 210.42

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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.