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Finding the Fourth Proportional to 81,942.40, 122,913.60 and 65,029.60

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Solution

The fourth proportional to 81,942.40, 122,913.60 and 65,029.60 is: 97,544.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,942.40 : 122,913.60 = 65,029.60 : x
  2. Step 2: Convert to fraction form
    81,942.40/122,913.60 = 65,029.60/x
  3. Step 3: Cross multiply
    81,942.40x = 122,913.60 × 65,029.60
  4. Step 4: Simplify right side
    81,942.40x = 7,993,022,242.56
  5. Step 5: Solve for x
    x = 7,993,022,242.56/81,942.40
  6. Step 6: Final answer
    x = 97,544.40

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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.