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Finding the Fourth Proportional to 19,171.20, 28,739.70 and 7,481.70

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Solution

The fourth proportional to 19,171.20, 28,739.70 and 7,481.70 is: 11,215.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,171.20 : 28,739.70 = 7,481.70 : x
  2. Step 2: Convert to fraction form
    19,171.20/28,739.70 = 7,481.70/x
  3. Step 3: Cross multiply
    19,171.20x = 28,739.70 × 7,481.70
  4. Step 4: Simplify right side
    19,171.20x = 215,021,813.49
  5. Step 5: Solve for x
    x = 215,021,813.49/19,171.20
  6. Step 6: Final answer
    x = 11,215.88

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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.