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Finding the Fourth Proportional to 68,991.42, 103,413.45 and 39,345.42

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Solution

The fourth proportional to 68,991.42, 103,413.45 and 39,345.42 is: 58,976.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    68,991.42 : 103,413.45 = 39,345.42 : x
  2. Step 2: Convert to fraction form
    68,991.42/103,413.45 = 39,345.42/x
  3. Step 3: Cross multiply
    68,991.42x = 103,413.45 × 39,345.42
  4. Step 4: Simplify right side
    68,991.42x = 4,068,845,623.90
  5. Step 5: Solve for x
    x = 4,068,845,623.90/68,991.42
  6. Step 6: Final answer
    x = 58,976.11

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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.