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Finding the Fourth Proportional to 256,398.69, 384,598.33 and 66,858.89

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Solution

The fourth proportional to 256,398.69, 384,598.33 and 66,858.89 is: 100,288.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,398.69 : 384,598.33 = 66,858.89 : x
  2. Step 2: Convert to fraction form
    256,398.69/384,598.33 = 66,858.89/x
  3. Step 3: Cross multiply
    256,398.69x = 384,598.33 × 66,858.89
  4. Step 4: Simplify right side
    256,398.69x = 25,713,817,439.65
  5. Step 5: Solve for x
    x = 25,713,817,439.65/256,398.69
  6. Step 6: Final answer
    x = 100,288.41

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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.