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Finding the Fourth Proportional to 12,469.68, 17,209.80 and 8,690.40

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Solution

The fourth proportional to 12,469.68, 17,209.80 and 8,690.40 is: 11,993.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,469.68 : 17,209.80 = 8,690.40 : x
  2. Step 2: Convert to fraction form
    12,469.68/17,209.80 = 8,690.40/x
  3. Step 3: Cross multiply
    12,469.68x = 17,209.80 × 8,690.40
  4. Step 4: Simplify right side
    12,469.68x = 149,560,045.92
  5. Step 5: Solve for x
    x = 149,560,045.92/12,469.68
  6. Step 6: Final answer
    x = 11,993.90

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.