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Finding the Fourth Proportional to 8,256, 12,389.40 and 3,639

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Solution

The fourth proportional to 8,256, 12,389.40 and 3,639 is: 5,460.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,256 : 12,389.40 = 3,639 : x
  2. Step 2: Convert to fraction form
    8,256/12,389.40 = 3,639/x
  3. Step 3: Cross multiply
    8,256x = 12,389.40 × 3,639
  4. Step 4: Simplify right side
    8,256x = 45,085,026.60
  5. Step 5: Solve for x
    x = 45,085,026.60/8,256
  6. Step 6: Final answer
    x = 5,460.88

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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.