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Finding the Fourth Proportional to 19,170.20, 28,738.20 and 7,480.70

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Solution

The fourth proportional to 19,170.20, 28,738.20 and 7,480.70 is: 11,214.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,170.20 : 28,738.20 = 7,480.70 : x
  2. Step 2: Convert to fraction form
    19,170.20/28,738.20 = 7,480.70/x
  3. Step 3: Cross multiply
    19,170.20x = 28,738.20 × 7,480.70
  4. Step 4: Simplify right side
    19,170.20x = 214,981,852.74
  5. Step 5: Solve for x
    x = 214,981,852.74/19,170.20
  6. Step 6: Final answer
    x = 11,214.38

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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.