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Finding the Fourth Proportional to 519,783.86, 718,003.80 and 391,690.59

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Solution

The fourth proportional to 519,783.86, 718,003.80 and 391,690.59 is: 541,062.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    519,783.86 : 718,003.80 = 391,690.59 : x
  2. Step 2: Convert to fraction form
    519,783.86/718,003.80 = 391,690.59/x
  3. Step 3: Cross multiply
    519,783.86x = 718,003.80 × 391,690.59
  4. Step 4: Simplify right side
    519,783.86x = 281,235,330,085.79
  5. Step 5: Solve for x
    x = 281,235,330,085.79/519,783.86
  6. Step 6: Final answer
    x = 541,062.07

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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.