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Finding the Fourth Proportional to 81,972.40, 122,958.60 and 81,972.40

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Solution

The fourth proportional to 81,972.40, 122,958.60 and 81,972.40 is: 122,958.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,972.40 : 122,958.60 = 81,972.40 : x
  2. Step 2: Convert to fraction form
    81,972.40/122,958.60 = 81,972.40/x
  3. Step 3: Cross multiply
    81,972.40x = 122,958.60 × 81,972.40
  4. Step 4: Simplify right side
    81,972.40x = 10,079,211,542.64
  5. Step 5: Solve for x
    x = 10,079,211,542.64/81,972.40
  6. Step 6: Final answer
    x = 122,958.60

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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.