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Finding the Fourth Proportional to 409,029.80, 613,563.90 and 128,556.20

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Solution

The fourth proportional to 409,029.80, 613,563.90 and 128,556.20 is: 192,840.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,029.80 : 613,563.90 = 128,556.20 : x
  2. Step 2: Convert to fraction form
    409,029.80/613,563.90 = 128,556.20/x
  3. Step 3: Cross multiply
    409,029.80x = 613,563.90 × 128,556.20
  4. Step 4: Simplify right side
    409,029.80x = 78,877,443,441.18
  5. Step 5: Solve for x
    x = 78,877,443,441.18/409,029.80
  6. Step 6: Final answer
    x = 192,840.33

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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.