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Finding the Fourth Proportional to 206,042.40, 309,063.60 and 72,921.60

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Solution

The fourth proportional to 206,042.40, 309,063.60 and 72,921.60 is: 109,382.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    206,042.40 : 309,063.60 = 72,921.60 : x
  2. Step 2: Convert to fraction form
    206,042.40/309,063.60 = 72,921.60/x
  3. Step 3: Cross multiply
    206,042.40x = 309,063.60 × 72,921.60
  4. Step 4: Simplify right side
    206,042.40x = 22,537,412,213.76
  5. Step 5: Solve for x
    x = 22,537,412,213.76/206,042.40
  6. Step 6: Final answer
    x = 109,382.40

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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.