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Finding the Fourth Proportional to 398,771.64, 598,217.34 and 128,809.62

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Solution

The fourth proportional to 398,771.64, 598,217.34 and 128,809.62 is: 193,233.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    398,771.64 : 598,217.34 = 128,809.62 : x
  2. Step 2: Convert to fraction form
    398,771.64/598,217.34 = 128,809.62/x
  3. Step 3: Cross multiply
    398,771.64x = 598,217.34 × 128,809.62
  4. Step 4: Simplify right side
    398,771.64x = 77,056,148,242.81
  5. Step 5: Solve for x
    x = 77,056,148,242.81/398,771.64
  6. Step 6: Final answer
    x = 193,233.77

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1.5x scale

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.