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Finding the Fourth Proportional to 84,093.94, 126,137.25 and 20,912.74

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Solution

The fourth proportional to 84,093.94, 126,137.25 and 20,912.74 is: 31,368.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    84,093.94 : 126,137.25 = 20,912.74 : x
  2. Step 2: Convert to fraction form
    84,093.94/126,137.25 = 20,912.74/x
  3. Step 3: Cross multiply
    84,093.94x = 126,137.25 × 20,912.74
  4. Step 4: Simplify right side
    84,093.94x = 2,637,875,513.57
  5. Step 5: Solve for x
    x = 2,637,875,513.57/84,093.94
  6. Step 6: Final answer
    x = 31,368.20

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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.