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Finding the Fourth Proportional to 515,388.88, 711,212.55 and 285,943.72

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Solution

The fourth proportional to 515,388.88, 711,212.55 and 285,943.72 is: 394,588.96

Step by Step Solution

  1. Step 1: Write the proportion equation
    515,388.88 : 711,212.55 = 285,943.72 : x
  2. Step 2: Convert to fraction form
    515,388.88/711,212.55 = 285,943.72/x
  3. Step 3: Cross multiply
    515,388.88x = 711,212.55 × 285,943.72
  4. Step 4: Simplify right side
    515,388.88x = 203,366,762,349.32
  5. Step 5: Solve for x
    x = 203,366,762,349.32/515,388.88
  6. Step 6: Final answer
    x = 394,588.96

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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.