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Finding the Fourth Proportional to 72,696.92, 109,046.44 and 19,390

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Solution

The fourth proportional to 72,696.92, 109,046.44 and 19,390 is: 29,085.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    72,696.92 : 109,046.44 = 19,390 : x
  2. Step 2: Convert to fraction form
    72,696.92/109,046.44 = 19,390/x
  3. Step 3: Cross multiply
    72,696.92x = 109,046.44 × 19,390
  4. Step 4: Simplify right side
    72,696.92x = 2,114,410,471.60
  5. Step 5: Solve for x
    x = 2,114,410,471.60/72,696.92
  6. Step 6: Final answer
    x = 29,085.28

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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.