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Finding the Fourth Proportional to 74,413.50, 102,690.63 and 40,879.50

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Solution

The fourth proportional to 74,413.50, 102,690.63 and 40,879.50 is: 56,413.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,413.50 : 102,690.63 = 40,879.50 : x
  2. Step 2: Convert to fraction form
    74,413.50/102,690.63 = 40,879.50/x
  3. Step 3: Cross multiply
    74,413.50x = 102,690.63 × 40,879.50
  4. Step 4: Simplify right side
    74,413.50x = 4,197,941,609.09
  5. Step 5: Solve for x
    x = 4,197,941,609.09/74,413.50
  6. Step 6: Final answer
    x = 56,413.71

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Why These Related Problems?

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