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Finding the Fourth Proportional to 8,690.80, 13,039.40 and 3,497.20

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Solution

The fourth proportional to 8,690.80, 13,039.40 and 3,497.20 is: 5,247.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    8,690.80 : 13,039.40 = 3,497.20 : x
  2. Step 2: Convert to fraction form
    8,690.80/13,039.40 = 3,497.20/x
  3. Step 3: Cross multiply
    8,690.80x = 13,039.40 × 3,497.20
  4. Step 4: Simplify right side
    8,690.80x = 45,601,389.68
  5. Step 5: Solve for x
    x = 45,601,389.68/8,690.80
  6. Step 6: Final answer
    x = 5,247.09

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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.