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Finding the Fourth Proportional to 8,391.89, 12,585.88 and 3,709.36

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Solution

The fourth proportional to 8,391.89, 12,585.88 and 3,709.36 is: 5,563.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,391.89 : 12,585.88 = 3,709.36 : x
  2. Step 2: Convert to fraction form
    8,391.89/12,585.88 = 3,709.36/x
  3. Step 3: Cross multiply
    8,391.89x = 12,585.88 × 3,709.36
  4. Step 4: Simplify right side
    8,391.89x = 46,685,527.11
  5. Step 5: Solve for x
    x = 46,685,527.11/8,391.89
  6. Step 6: Final answer
    x = 5,563.17

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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.