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Finding the Fourth Proportional to 207,855.40, 311,783.10 and 205,090.60

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Solution

The fourth proportional to 207,855.40, 311,783.10 and 205,090.60 is: 307,635.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    207,855.40 : 311,783.10 = 205,090.60 : x
  2. Step 2: Convert to fraction form
    207,855.40/311,783.10 = 205,090.60/x
  3. Step 3: Cross multiply
    207,855.40x = 311,783.10 × 205,090.60
  4. Step 4: Simplify right side
    207,855.40x = 63,943,783,048.86
  5. Step 5: Solve for x
    x = 63,943,783,048.86/207,855.40
  6. Step 6: Final answer
    x = 307,635.90

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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.