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Finding the Fourth Proportional to 8,491.85, 12,721.20 and 5,561.27

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Solution

The fourth proportional to 8,491.85, 12,721.20 and 5,561.27 is: 8,331.05

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,491.85 : 12,721.20 = 5,561.27 : x
  2. Step 2: Convert to fraction form
    8,491.85/12,721.20 = 5,561.27/x
  3. Step 3: Cross multiply
    8,491.85x = 12,721.20 × 5,561.27
  4. Step 4: Simplify right side
    8,491.85x = 70,746,027.92
  5. Step 5: Solve for x
    x = 70,746,027.92/8,491.85
  6. Step 6: Final answer
    x = 8,331.05

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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.