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Finding the Fourth Proportional to 279,008.72, 385,116.36 and 189,636.56

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Solution

The fourth proportional to 279,008.72, 385,116.36 and 189,636.56 is: 261,755.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    279,008.72 : 385,116.36 = 189,636.56 : x
  2. Step 2: Convert to fraction form
    279,008.72/385,116.36 = 189,636.56/x
  3. Step 3: Cross multiply
    279,008.72x = 385,116.36 × 189,636.56
  4. Step 4: Simplify right side
    279,008.72x = 73,032,141,710.12
  5. Step 5: Solve for x
    x = 73,032,141,710.12/279,008.72
  6. Step 6: Final answer
    x = 261,755.77

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.