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Finding the Fourth Proportional to 21,379.34, 32,051.72 and 8,908.74

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Solution

The fourth proportional to 21,379.34, 32,051.72 and 8,908.74 is: 13,355.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,379.34 : 32,051.72 = 8,908.74 : x
  2. Step 2: Convert to fraction form
    21,379.34/32,051.72 = 8,908.74/x
  3. Step 3: Cross multiply
    21,379.34x = 32,051.72 × 8,908.74
  4. Step 4: Simplify right side
    21,379.34x = 285,540,440.03
  5. Step 5: Solve for x
    x = 285,540,440.03/21,379.34
  6. Step 6: Final answer
    x = 13,355.91

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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.