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Finding the Fourth Proportional to 21,291.26, 31,939.50 and 11,911.10

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Solution

The fourth proportional to 21,291.26, 31,939.50 and 11,911.10 is: 17,868.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,291.26 : 31,939.50 = 11,911.10 : x
  2. Step 2: Convert to fraction form
    21,291.26/31,939.50 = 11,911.10/x
  3. Step 3: Cross multiply
    21,291.26x = 31,939.50 × 11,911.10
  4. Step 4: Simplify right side
    21,291.26x = 380,434,578.45
  5. Step 5: Solve for x
    x = 380,434,578.45/21,291.26
  6. Step 6: Final answer
    x = 17,868.11

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These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.