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Finding the Fourth Proportional to 21,938, 32,910.42 and 7,143.43

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Solution

The fourth proportional to 21,938, 32,910.42 and 7,143.43 is: 10,716.26

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,938 : 32,910.42 = 7,143.43 : x
  2. Step 2: Convert to fraction form
    21,938/32,910.42 = 7,143.43/x
  3. Step 3: Cross multiply
    21,938x = 32,910.42 × 7,143.43
  4. Step 4: Simplify right side
    21,938x = 235,093,281.54
  5. Step 5: Solve for x
    x = 235,093,281.54/21,938
  6. Step 6: Final answer
    x = 10,716.26

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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.