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Finding the Fourth Proportional to 18,928,279.80, 28,392,419.70 and 13,889,431.80

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Solution

The fourth proportional to 18,928,279.80, 28,392,419.70 and 13,889,431.80 is: 20,834,147.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,928,279.80 : 28,392,419.70 = 13,889,431.80 : x
  2. Step 2: Convert to fraction form
    18,928,279.80/28,392,419.70 = 13,889,431.80/x
  3. Step 3: Cross multiply
    18,928,279.80x = 28,392,419.70 × 13,889,431.80
  4. Step 4: Simplify right side
    18,928,279.80x = 394,354,577,060,126.50
  5. Step 5: Solve for x
    x = 394,354,577,060,126.50/18,928,279.80
  6. Step 6: Final answer
    x = 20,834,147.70

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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.