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Finding the Fourth Proportional to 20,273.28, 27,978.24 and 11,890.56

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Solution

The fourth proportional to 20,273.28, 27,978.24 and 11,890.56 is: 16,409.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,273.28 : 27,978.24 = 11,890.56 : x
  2. Step 2: Convert to fraction form
    20,273.28/27,978.24 = 11,890.56/x
  3. Step 3: Cross multiply
    20,273.28x = 27,978.24 × 11,890.56
  4. Step 4: Simplify right side
    20,273.28x = 332,676,941.41
  5. Step 5: Solve for x
    x = 332,676,941.41/20,273.28
  6. Step 6: Final answer
    x = 16,409.63

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1.5x scale

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.