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Finding the Fourth Proportional to 206,611.20, 309,916.80 and 143,625.60

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Solution

The fourth proportional to 206,611.20, 309,916.80 and 143,625.60 is: 215,438.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,611.20 : 309,916.80 = 143,625.60 : x
  2. Step 2: Convert to fraction form
    206,611.20/309,916.80 = 143,625.60/x
  3. Step 3: Cross multiply
    206,611.20x = 309,916.80 × 143,625.60
  4. Step 4: Simplify right side
    206,611.20x = 44,511,986,350.08
  5. Step 5: Solve for x
    x = 44,511,986,350.08/206,611.20
  6. Step 6: Final answer
    x = 215,438.40

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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.