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Finding the Fourth Proportional to 194,388.80, 291,698.40 and 128,019.20

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Solution

The fourth proportional to 194,388.80, 291,698.40 and 128,019.20 is: 192,104.67

Step by Step Solution

  1. Step 1: Write the proportion equation
    194,388.80 : 291,698.40 = 128,019.20 : x
  2. Step 2: Convert to fraction form
    194,388.80/291,698.40 = 128,019.20/x
  3. Step 3: Cross multiply
    194,388.80x = 291,698.40 × 128,019.20
  4. Step 4: Simplify right side
    194,388.80x = 37,342,995,809.28
  5. Step 5: Solve for x
    x = 37,342,995,809.28/194,388.80
  6. Step 6: Final answer
    x = 192,104.67

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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.