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Finding the Fourth Proportional to 71,121.81, 106,608.60 and 28,983.60

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Solution

The fourth proportional to 71,121.81, 106,608.60 and 28,983.60 is: 43,445.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,121.81 : 106,608.60 = 28,983.60 : x
  2. Step 2: Convert to fraction form
    71,121.81/106,608.60 = 28,983.60/x
  3. Step 3: Cross multiply
    71,121.81x = 106,608.60 × 28,983.60
  4. Step 4: Simplify right side
    71,121.81x = 3,089,901,018.96
  5. Step 5: Solve for x
    x = 3,089,901,018.96/71,121.81
  6. Step 6: Final answer
    x = 43,445.20

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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.