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Finding the Fourth Proportional to 15,009.73, 20,714.64 and 8,638.36

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Solution

The fourth proportional to 15,009.73, 20,714.64 and 8,638.36 is: 11,921.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,009.73 : 20,714.64 = 8,638.36 : x
  2. Step 2: Convert to fraction form
    15,009.73/20,714.64 = 8,638.36/x
  3. Step 3: Cross multiply
    15,009.73x = 20,714.64 × 8,638.36
  4. Step 4: Simplify right side
    15,009.73x = 178,940,517.59
  5. Step 5: Solve for x
    x = 178,940,517.59/15,009.73
  6. Step 6: Final answer
    x = 11,921.63

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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.