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Finding the Fourth Proportional to 12,728.80, 19,093.20 and 3,494.80

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Solution

The fourth proportional to 12,728.80, 19,093.20 and 3,494.80 is: 5,242.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,728.80 : 19,093.20 = 3,494.80 : x
  2. Step 2: Convert to fraction form
    12,728.80/19,093.20 = 3,494.80/x
  3. Step 3: Cross multiply
    12,728.80x = 19,093.20 × 3,494.80
  4. Step 4: Simplify right side
    12,728.80x = 66,726,915.36
  5. Step 5: Solve for x
    x = 66,726,915.36/12,728.80
  6. Step 6: Final answer
    x = 5,242.20

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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.