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Finding the Fourth Proportional to 8,409, 12,618.36 and 3,792

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Solution

The fourth proportional to 8,409, 12,618.36 and 3,792 is: 5,690.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,409 : 12,618.36 = 3,792 : x
  2. Step 2: Convert to fraction form
    8,409/12,618.36 = 3,792/x
  3. Step 3: Cross multiply
    8,409x = 12,618.36 × 3,792
  4. Step 4: Simplify right side
    8,409x = 47,848,821.12
  5. Step 5: Solve for x
    x = 47,848,821.12/8,409
  6. Step 6: Final answer
    x = 5,690.19

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Why These Related Problems?

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