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Finding the Fourth Proportional to 8,491.20, 12,736.32 and 2,647.68

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Solution

The fourth proportional to 8,491.20, 12,736.32 and 2,647.68 is: 3,971.37

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,491.20 : 12,736.32 = 2,647.68 : x
  2. Step 2: Convert to fraction form
    8,491.20/12,736.32 = 2,647.68/x
  3. Step 3: Cross multiply
    8,491.20x = 12,736.32 × 2,647.68
  4. Step 4: Simplify right side
    8,491.20x = 33,721,699.74
  5. Step 5: Solve for x
    x = 33,721,699.74/8,491.20
  6. Step 6: Final answer
    x = 3,971.37

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1.5x scale

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.