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Finding the Fourth Proportional to 20,965.89, 28,926.04 and 11,890.22

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Solution

The fourth proportional to 20,965.89, 28,926.04 and 11,890.22 is: 16,404.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,965.89 : 28,926.04 = 11,890.22 : x
  2. Step 2: Convert to fraction form
    20,965.89/28,926.04 = 11,890.22/x
  3. Step 3: Cross multiply
    20,965.89x = 28,926.04 × 11,890.22
  4. Step 4: Simplify right side
    20,965.89x = 343,936,875.18
  5. Step 5: Solve for x
    x = 343,936,875.18/20,965.89
  6. Step 6: Final answer
    x = 16,404.59

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These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.