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Finding the Fourth Proportional to 21,687.76, 32,508.60 and 8,538.32

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Solution

The fourth proportional to 21,687.76, 32,508.60 and 8,538.32 is: 12,798.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,687.76 : 32,508.60 = 8,538.32 : x
  2. Step 2: Convert to fraction form
    21,687.76/32,508.60 = 8,538.32/x
  3. Step 3: Cross multiply
    21,687.76x = 32,508.60 × 8,538.32
  4. Step 4: Simplify right side
    21,687.76x = 277,568,829.55
  5. Step 5: Solve for x
    x = 277,568,829.55/21,687.76
  6. Step 6: Final answer
    x = 12,798.41

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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.