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Finding the Fourth Proportional to 20,889.52, 28,826.04 and 11,456.56

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Solution

The fourth proportional to 20,889.52, 28,826.04 and 11,456.56 is: 15,809.23

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,889.52 : 28,826.04 = 11,456.56 : x
  2. Step 2: Convert to fraction form
    20,889.52/28,826.04 = 11,456.56/x
  3. Step 3: Cross multiply
    20,889.52x = 28,826.04 × 11,456.56
  4. Step 4: Simplify right side
    20,889.52x = 330,247,256.82
  5. Step 5: Solve for x
    x = 330,247,256.82/20,889.52
  6. Step 6: Final answer
    x = 15,809.23

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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.