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Finding the Fourth Proportional to 685,392.51, 945,841.55 and 383,586.51

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Solution

The fourth proportional to 685,392.51, 945,841.55 and 383,586.51 is: 529,349.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,392.51 : 945,841.55 = 383,586.51 : x
  2. Step 2: Convert to fraction form
    685,392.51/945,841.55 = 383,586.51/x
  3. Step 3: Cross multiply
    685,392.51x = 945,841.55 × 383,586.51
  4. Step 4: Simplify right side
    685,392.51x = 362,812,057,259.56
  5. Step 5: Solve for x
    x = 362,812,057,259.56/685,392.51
  6. Step 6: Final answer
    x = 529,349.32

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Half scale
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Double scale
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Similar ratio
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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.