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Finding the Fourth Proportional to 12,640.80, 18,922.80 and 11,258.40

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Solution

The fourth proportional to 12,640.80, 18,922.80 and 11,258.40 is: 16,853.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,640.80 : 18,922.80 = 11,258.40 : x
  2. Step 2: Convert to fraction form
    12,640.80/18,922.80 = 11,258.40/x
  3. Step 3: Cross multiply
    12,640.80x = 18,922.80 × 11,258.40
  4. Step 4: Simplify right side
    12,640.80x = 213,040,451.52
  5. Step 5: Solve for x
    x = 213,040,451.52/12,640.80
  6. Step 6: Final answer
    x = 16,853.40

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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.