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Finding the Fourth Proportional to 81,043.70, 121,608.36 and 57,503.37

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Solution

The fourth proportional to 81,043.70, 121,608.36 and 57,503.37 is: 86,285.44

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,043.70 : 121,608.36 = 57,503.37 : x
  2. Step 2: Convert to fraction form
    81,043.70/121,608.36 = 57,503.37/x
  3. Step 3: Cross multiply
    81,043.70x = 121,608.36 × 57,503.37
  4. Step 4: Simplify right side
    81,043.70x = 6,992,890,520.17
  5. Step 5: Solve for x
    x = 6,992,890,520.17/81,043.70
  6. Step 6: Final answer
    x = 86,285.44

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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.