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Finding the Fourth Proportional to 205,846.80, 308,770.20 and 139,318.80

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Solution

The fourth proportional to 205,846.80, 308,770.20 and 139,318.80 is: 208,978.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    205,846.80 : 308,770.20 = 139,318.80 : x
  2. Step 2: Convert to fraction form
    205,846.80/308,770.20 = 139,318.80/x
  3. Step 3: Cross multiply
    205,846.80x = 308,770.20 × 139,318.80
  4. Step 4: Simplify right side
    205,846.80x = 43,017,493,739.76
  5. Step 5: Solve for x
    x = 43,017,493,739.76/205,846.80
  6. Step 6: Final answer
    x = 208,978.20

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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.