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Finding the Fourth Proportional to 685,410.69, 945,740.69 and 394,981.53

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Solution

The fourth proportional to 685,410.69, 945,740.69 and 394,981.53 is: 545,001.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,410.69 : 945,740.69 = 394,981.53 : x
  2. Step 2: Convert to fraction form
    685,410.69/945,740.69 = 394,981.53/x
  3. Step 3: Cross multiply
    685,410.69x = 945,740.69 × 394,981.53
  4. Step 4: Simplify right side
    685,410.69x = 373,550,108,220.76
  5. Step 5: Solve for x
    x = 373,550,108,220.76/685,410.69
  6. Step 6: Final answer
    x = 545,001.87

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Double scale
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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.