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Finding the Fourth Proportional to 499,920.54, 689,873.19 and 285,129.81

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Solution

The fourth proportional to 499,920.54, 689,873.19 and 285,129.81 is: 393,469.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    499,920.54 : 689,873.19 = 285,129.81 : x
  2. Step 2: Convert to fraction form
    499,920.54/689,873.19 = 285,129.81/x
  3. Step 3: Cross multiply
    499,920.54x = 689,873.19 × 285,129.81
  4. Step 4: Simplify right side
    499,920.54x = 196,703,411,588.79
  5. Step 5: Solve for x
    x = 196,703,411,588.79/499,920.54
  6. Step 6: Final answer
    x = 393,469.35

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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.