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Finding the Fourth Proportional to 21,920.73, 30,243.47 and 13,413.98

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Solution

The fourth proportional to 21,920.73, 30,243.47 and 13,413.98 is: 18,506.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,920.73 : 30,243.47 = 13,413.98 : x
  2. Step 2: Convert to fraction form
    21,920.73/30,243.47 = 13,413.98/x
  3. Step 3: Cross multiply
    21,920.73x = 30,243.47 × 13,413.98
  4. Step 4: Simplify right side
    21,920.73x = 405,685,133.73
  5. Step 5: Solve for x
    x = 405,685,133.73/21,920.73
  6. Step 6: Final answer
    x = 18,506.92

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.