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Finding the Fourth Proportional to 8,491.89, 12,739.23 and 2,647.32

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Solution

The fourth proportional to 8,491.89, 12,739.23 and 2,647.32 is: 3,971.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,491.89 : 12,739.23 = 2,647.32 : x
  2. Step 2: Convert to fraction form
    8,491.89/12,739.23 = 2,647.32/x
  3. Step 3: Cross multiply
    8,491.89x = 12,739.23 × 2,647.32
  4. Step 4: Simplify right side
    8,491.89x = 33,724,818.36
  5. Step 5: Solve for x
    x = 33,724,818.36/8,491.89
  6. Step 6: Final answer
    x = 3,971.41

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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.