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Finding the Fourth Proportional to 210,604.80, 315,907.20 and 131,961.60

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Solution

The fourth proportional to 210,604.80, 315,907.20 and 131,961.60 is: 197,942.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    210,604.80 : 315,907.20 = 131,961.60 : x
  2. Step 2: Convert to fraction form
    210,604.80/315,907.20 = 131,961.60/x
  3. Step 3: Cross multiply
    210,604.80x = 315,907.20 × 131,961.60
  4. Step 4: Simplify right side
    210,604.80x = 41,687,619,563.52
  5. Step 5: Solve for x
    x = 41,687,619,563.52/210,604.80
  6. Step 6: Final answer
    x = 197,942.40

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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.