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Finding the Fourth Proportional to 413.81, 620.90 and 157.25

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Solution

The fourth proportional to 413.81, 620.90 and 157.25 is: 235.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    413.81 : 620.90 = 157.25 : x
  2. Step 2: Convert to fraction form
    413.81/620.90 = 157.25/x
  3. Step 3: Cross multiply
    413.81x = 620.90 × 157.25
  4. Step 4: Simplify right side
    413.81x = 97,636.53
  5. Step 5: Solve for x
    x = 97,636.53/413.81
  6. Step 6: Final answer
    x = 235.95

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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.