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Finding the Fourth Proportional to 8,638.77, 12,957.30 and 3,091.89

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Solution

The fourth proportional to 8,638.77, 12,957.30 and 3,091.89 is: 4,637.53

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,638.77 : 12,957.30 = 3,091.89 : x
  2. Step 2: Convert to fraction form
    8,638.77/12,957.30 = 3,091.89/x
  3. Step 3: Cross multiply
    8,638.77x = 12,957.30 × 3,091.89
  4. Step 4: Simplify right side
    8,638.77x = 40,062,546.30
  5. Step 5: Solve for x
    x = 40,062,546.30/8,638.77
  6. Step 6: Final answer
    x = 4,637.53

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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.