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Finding the Fourth Proportional to 391,064.50, 586,363.79 and 121,112.67

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Solution

The fourth proportional to 391,064.50, 586,363.79 and 121,112.67 is: 181,596.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    391,064.50 : 586,363.79 = 121,112.67 : x
  2. Step 2: Convert to fraction form
    391,064.50/586,363.79 = 121,112.67/x
  3. Step 3: Cross multiply
    391,064.50x = 586,363.79 × 121,112.67
  4. Step 4: Simplify right side
    391,064.50x = 71,016,084,809.78
  5. Step 5: Solve for x
    x = 71,016,084,809.78/391,064.50
  6. Step 6: Final answer
    x = 181,596.86

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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.