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Finding the Fourth Proportional to 21,605.91, 32,408.86 and 5,189.91

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Solution

The fourth proportional to 21,605.91, 32,408.86 and 5,189.91 is: 7,784.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,605.91 : 32,408.86 = 5,189.91 : x
  2. Step 2: Convert to fraction form
    21,605.91/32,408.86 = 5,189.91/x
  3. Step 3: Cross multiply
    21,605.91x = 32,408.86 × 5,189.91
  4. Step 4: Simplify right side
    21,605.91x = 168,198,941.83
  5. Step 5: Solve for x
    x = 168,198,941.83/21,605.91
  6. Step 6: Final answer
    x = 7,784.86

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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.