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Finding the Fourth Proportional to 13,860.78, 20,790.81 and 5,091.90

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Solution

The fourth proportional to 13,860.78, 20,790.81 and 5,091.90 is: 7,637.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,860.78 : 20,790.81 = 5,091.90 : x
  2. Step 2: Convert to fraction form
    13,860.78/20,790.81 = 5,091.90/x
  3. Step 3: Cross multiply
    13,860.78x = 20,790.81 × 5,091.90
  4. Step 4: Simplify right side
    13,860.78x = 105,864,725.44
  5. Step 5: Solve for x
    x = 105,864,725.44/13,860.78
  6. Step 6: Final answer
    x = 7,637.72

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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.