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Finding the Fourth Proportional to 20,810.14, 28,709.90 and 13,255.12

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Solution

The fourth proportional to 20,810.14, 28,709.90 and 13,255.12 is: 18,286.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.14 : 28,709.90 = 13,255.12 : x
  2. Step 2: Convert to fraction form
    20,810.14/28,709.90 = 13,255.12/x
  3. Step 3: Cross multiply
    20,810.14x = 28,709.90 × 13,255.12
  4. Step 4: Simplify right side
    20,810.14x = 380,552,959.86
  5. Step 5: Solve for x
    x = 380,552,959.86/20,810.14
  6. Step 6: Final answer
    x = 18,286.90

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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.