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Finding the Fourth Proportional to 256,072.80, 384,109.20 and 211,749.60

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Solution

The fourth proportional to 256,072.80, 384,109.20 and 211,749.60 is: 317,624.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,072.80 : 384,109.20 = 211,749.60 : x
  2. Step 2: Convert to fraction form
    256,072.80/384,109.20 = 211,749.60/x
  3. Step 3: Cross multiply
    256,072.80x = 384,109.20 × 211,749.60
  4. Step 4: Simplify right side
    256,072.80x = 81,334,969,456.32
  5. Step 5: Solve for x
    x = 81,334,969,456.32/256,072.80
  6. Step 6: Final answer
    x = 317,624.40

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1.5x scale

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.