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Finding the Fourth Proportional to 8,491.67, 12,720.96 and 5,561.09

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Solution

The fourth proportional to 8,491.67, 12,720.96 and 5,561.09 is: 8,330.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,491.67 : 12,720.96 = 5,561.09 : x
  2. Step 2: Convert to fraction form
    8,491.67/12,720.96 = 5,561.09/x
  3. Step 3: Cross multiply
    8,491.67x = 12,720.96 × 5,561.09
  4. Step 4: Simplify right side
    8,491.67x = 70,742,403.45
  5. Step 5: Solve for x
    x = 70,742,403.45/8,491.67
  6. Step 6: Final answer
    x = 8,330.80

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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.