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Finding the Fourth Proportional to 143,404.80, 215,107.20 and 137,961.60

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Solution

The fourth proportional to 143,404.80, 215,107.20 and 137,961.60 is: 206,942.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    143,404.80 : 215,107.20 = 137,961.60 : x
  2. Step 2: Convert to fraction form
    143,404.80/215,107.20 = 137,961.60/x
  3. Step 3: Cross multiply
    143,404.80x = 215,107.20 × 137,961.60
  4. Step 4: Simplify right side
    143,404.80x = 29,676,533,483.52
  5. Step 5: Solve for x
    x = 29,676,533,483.52/143,404.80
  6. Step 6: Final answer
    x = 206,942.40

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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.