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Finding the Fourth Proportional to 409,171.20, 613,756.80 and 128,774.40

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Solution

The fourth proportional to 409,171.20, 613,756.80 and 128,774.40 is: 193,161.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    409,171.20 : 613,756.80 = 128,774.40 : x
  2. Step 2: Convert to fraction form
    409,171.20/613,756.80 = 128,774.40/x
  3. Step 3: Cross multiply
    409,171.20x = 613,756.80 × 128,774.40
  4. Step 4: Simplify right side
    409,171.20x = 79,036,163,665.92
  5. Step 5: Solve for x
    x = 79,036,163,665.92/409,171.20
  6. Step 6: Final answer
    x = 193,161.60

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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.