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Finding the Fourth Proportional to 18,688, 25,789.44 and 11,236

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Solution

The fourth proportional to 18,688, 25,789.44 and 11,236 is: 15,505.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,688 : 25,789.44 = 11,236 : x
  2. Step 2: Convert to fraction form
    18,688/25,789.44 = 11,236/x
  3. Step 3: Cross multiply
    18,688x = 25,789.44 × 11,236
  4. Step 4: Simplify right side
    18,688x = 289,770,147.84
  5. Step 5: Solve for x
    x = 289,770,147.84/18,688
  6. Step 6: Final answer
    x = 15,505.68

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.