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Finding the Fourth Proportional to 427,270.40, 640,905.60 and 206,086.40

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Solution

The fourth proportional to 427,270.40, 640,905.60 and 206,086.40 is: 309,129.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,270.40 : 640,905.60 = 206,086.40 : x
  2. Step 2: Convert to fraction form
    427,270.40/640,905.60 = 206,086.40/x
  3. Step 3: Cross multiply
    427,270.40x = 640,905.60 × 206,086.40
  4. Step 4: Simplify right side
    427,270.40x = 132,081,927,843.84
  5. Step 5: Solve for x
    x = 132,081,927,843.84/427,270.40
  6. Step 6: Final answer
    x = 309,129.60

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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.