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Finding the Fourth Proportional to 78,980.67, 108,992.93 and 43,172.73

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Solution

The fourth proportional to 78,980.67, 108,992.93 and 43,172.73 is: 59,578.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,980.67 : 108,992.93 = 43,172.73 : x
  2. Step 2: Convert to fraction form
    78,980.67/108,992.93 = 43,172.73/x
  3. Step 3: Cross multiply
    78,980.67x = 108,992.93 × 43,172.73
  4. Step 4: Simplify right side
    78,980.67x = 4,705,522,122.94
  5. Step 5: Solve for x
    x = 4,705,522,122.94/78,980.67
  6. Step 6: Final answer
    x = 59,578.15

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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.