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Finding the Fourth Proportional to 620,105.12, 855,157.20 and 405,429.20

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Solution

The fourth proportional to 620,105.12, 855,157.20 and 405,429.20 is: 559,107.95

Step by Step Solution

  1. Step 1: Write the proportion equation
    620,105.12 : 855,157.20 = 405,429.20 : x
  2. Step 2: Convert to fraction form
    620,105.12/855,157.20 = 405,429.20/x
  3. Step 3: Cross multiply
    620,105.12x = 855,157.20 × 405,429.20
  4. Step 4: Simplify right side
    620,105.12x = 346,705,699,470.24
  5. Step 5: Solve for x
    x = 346,705,699,470.24/620,105.12
  6. Step 6: Final answer
    x = 559,107.95

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.