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Finding the Fourth Proportional to 21,636.52, 29,858.42 and 12,683.99

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Solution

The fourth proportional to 21,636.52, 29,858.42 and 12,683.99 is: 17,503.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,636.52 : 29,858.42 = 12,683.99 : x
  2. Step 2: Convert to fraction form
    21,636.52/29,858.42 = 12,683.99/x
  3. Step 3: Cross multiply
    21,636.52x = 29,858.42 × 12,683.99
  4. Step 4: Simplify right side
    21,636.52x = 378,724,007.05
  5. Step 5: Solve for x
    x = 378,724,007.05/21,636.52
  6. Step 6: Final answer
    x = 17,503.93

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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.