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Finding the Fourth Proportional to 18,978,934.50, 28,477,076.85 and 10,330,078.50

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Solution

The fourth proportional to 18,978,934.50, 28,477,076.85 and 10,330,078.50 is: 15,499,839.54

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978,934.50 : 28,477,076.85 = 10,330,078.50 : x
  2. Step 2: Convert to fraction form
    18,978,934.50/28,477,076.85 = 10,330,078.50/x
  3. Step 3: Cross multiply
    18,978,934.50x = 28,477,076.85 × 10,330,078.50
  4. Step 4: Simplify right side
    18,978,934.50x = 294,170,439,311,032.75
  5. Step 5: Solve for x
    x = 294,170,439,311,032.75/18,978,934.50
  6. Step 6: Final answer
    x = 15,499,839.54

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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.