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Finding the Fourth Proportional to 18,986.14, 28,481.64 and 7,297.84

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Solution

The fourth proportional to 18,986.14, 28,481.64 and 7,297.84 is: 10,947.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,986.14 : 28,481.64 = 7,297.84 : x
  2. Step 2: Convert to fraction form
    18,986.14/28,481.64 = 7,297.84/x
  3. Step 3: Cross multiply
    18,986.14x = 28,481.64 × 7,297.84
  4. Step 4: Simplify right side
    18,986.14x = 207,854,451.66
  5. Step 5: Solve for x
    x = 207,854,451.66/18,986.14
  6. Step 6: Final answer
    x = 10,947.69

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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.