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Finding the Fourth Proportional to 409,393.20, 614,176.20 and 128,938.80

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Solution

The fourth proportional to 409,393.20, 614,176.20 and 128,938.80 is: 193,435.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,393.20 : 614,176.20 = 128,938.80 : x
  2. Step 2: Convert to fraction form
    409,393.20/614,176.20 = 128,938.80/x
  3. Step 3: Cross multiply
    409,393.20x = 614,176.20 × 128,938.80
  4. Step 4: Simplify right side
    409,393.20x = 79,191,142,216.56
  5. Step 5: Solve for x
    x = 79,191,142,216.56/409,393.20
  6. Step 6: Final answer
    x = 193,435.41

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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.