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Finding the Fourth Proportional to 275.21, 413.33 and 172.70

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Solution

The fourth proportional to 275.21, 413.33 and 172.70 is: 259.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    275.21 : 413.33 = 172.70 : x
  2. Step 2: Convert to fraction form
    275.21/413.33 = 172.70/x
  3. Step 3: Cross multiply
    275.21x = 413.33 × 172.70
  4. Step 4: Simplify right side
    275.21x = 71,379.16
  5. Step 5: Solve for x
    x = 71,379.16/275.21
  6. Step 6: Final answer
    x = 259.37

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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.