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Finding the Fourth Proportional to 81,490.80, 122,090.40 and 50,289.60

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Solution

The fourth proportional to 81,490.80, 122,090.40 and 50,289.60 is: 75,344.42

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,490.80 : 122,090.40 = 50,289.60 : x
  2. Step 2: Convert to fraction form
    81,490.80/122,090.40 = 50,289.60/x
  3. Step 3: Cross multiply
    81,490.80x = 122,090.40 × 50,289.60
  4. Step 4: Simplify right side
    81,490.80x = 6,139,877,379.84
  5. Step 5: Solve for x
    x = 6,139,877,379.84/81,490.80
  6. Step 6: Final answer
    x = 75,344.42

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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.