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Finding the Fourth Proportional to 21,828.69, 32,745.45 and 7,791.99

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Solution

The fourth proportional to 21,828.69, 32,745.45 and 7,791.99 is: 11,688.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,828.69 : 32,745.45 = 7,791.99 : x
  2. Step 2: Convert to fraction form
    21,828.69/32,745.45 = 7,791.99/x
  3. Step 3: Cross multiply
    21,828.69x = 32,745.45 × 7,791.99
  4. Step 4: Simplify right side
    21,828.69x = 255,152,218.95
  5. Step 5: Solve for x
    x = 255,152,218.95/21,828.69
  6. Step 6: Final answer
    x = 11,688.85

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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.