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Finding the Fourth Proportional to 647,605.12, 893,651.52 and 405,879.04

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Solution

The fourth proportional to 647,605.12, 893,651.52 and 405,879.04 is: 560,085.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,605.12 : 893,651.52 = 405,879.04 : x
  2. Step 2: Convert to fraction form
    647,605.12/893,651.52 = 405,879.04/x
  3. Step 3: Cross multiply
    647,605.12x = 893,651.52 × 405,879.04
  4. Step 4: Simplify right side
    647,605.12x = 362,714,421,032.14
  5. Step 5: Solve for x
    x = 362,714,421,032.14/647,605.12
  6. Step 6: Final answer
    x = 560,085.78

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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.