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Finding the Fourth Proportional to 19,278.88, 28,949.72 and 11,930.16

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Solution

The fourth proportional to 19,278.88, 28,949.72 and 11,930.16 is: 17,914.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,278.88 : 28,949.72 = 11,930.16 : x
  2. Step 2: Convert to fraction form
    19,278.88/28,949.72 = 11,930.16/x
  3. Step 3: Cross multiply
    19,278.88x = 28,949.72 × 11,930.16
  4. Step 4: Simplify right side
    19,278.88x = 345,374,791.56
  5. Step 5: Solve for x
    x = 345,374,791.56/19,278.88
  6. Step 6: Final answer
    x = 17,914.67

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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.