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Finding the Fourth Proportional to 647,420.78, 893,556.06 and 405,910.34

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Solution

The fourth proportional to 647,420.78, 893,556.06 and 405,910.34 is: 560,228.61

Step by Step Solution

  1. Step 1: Write the proportion equation
    647,420.78 : 893,556.06 = 405,910.34 : x
  2. Step 2: Convert to fraction form
    647,420.78/893,556.06 = 405,910.34/x
  3. Step 3: Cross multiply
    647,420.78x = 893,556.06 × 405,910.34
  4. Step 4: Simplify right side
    647,420.78x = 362,703,644,123.66
  5. Step 5: Solve for x
    x = 362,703,644,123.66/647,420.78
  6. Step 6: Final answer
    x = 560,228.61

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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.