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Finding the Fourth Proportional to 685,009.92, 945,312.32 and 383,203.92

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Solution

The fourth proportional to 685,009.92, 945,312.32 and 383,203.92 is: 528,820.64

Step by Step Solution

  1. Step 1: Write the proportion equation
    685,009.92 : 945,312.32 = 383,203.92 : x
  2. Step 2: Convert to fraction form
    685,009.92/945,312.32 = 383,203.92/x
  3. Step 3: Cross multiply
    685,009.92x = 945,312.32 × 383,203.92
  4. Step 4: Simplify right side
    685,009.92x = 362,247,386,648.29
  5. Step 5: Solve for x
    x = 362,247,386,648.29/685,009.92
  6. Step 6: Final answer
    x = 528,820.64

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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.