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Finding the Fourth Proportional to 409,062.30, 613,593.45 and 128,579.55

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Solution

The fourth proportional to 409,062.30, 613,593.45 and 128,579.55 is: 192,869.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,062.30 : 613,593.45 = 128,579.55 : x
  2. Step 2: Convert to fraction form
    409,062.30/613,593.45 = 128,579.55/x
  3. Step 3: Cross multiply
    409,062.30x = 613,593.45 × 128,579.55
  4. Step 4: Simplify right side
    409,062.30x = 78,895,569,683.95
  5. Step 5: Solve for x
    x = 78,895,569,683.95/409,062.30
  6. Step 6: Final answer
    x = 192,869.33

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Similar ratio
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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.