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Finding the Fourth Proportional to 143,786.80, 215,518.20 and 68,942.80

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Solution

The fourth proportional to 143,786.80, 215,518.20 and 68,942.80 is: 103,336.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,786.80 : 215,518.20 = 68,942.80 : x
  2. Step 2: Convert to fraction form
    143,786.80/215,518.20 = 68,942.80/x
  3. Step 3: Cross multiply
    143,786.80x = 215,518.20 × 68,942.80
  4. Step 4: Simplify right side
    143,786.80x = 14,858,428,158.96
  5. Step 5: Solve for x
    x = 14,858,428,158.96/143,786.80
  6. Step 6: Final answer
    x = 103,336.52

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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.