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Finding the Fourth Proportional to 665,649.06, 918,660 and 393,804.36

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Solution

The fourth proportional to 665,649.06, 918,660 and 393,804.36 is: 543,488.06

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,649.06 : 918,660 = 393,804.36 : x
  2. Step 2: Convert to fraction form
    665,649.06/918,660 = 393,804.36/x
  3. Step 3: Cross multiply
    665,649.06x = 918,660 × 393,804.36
  4. Step 4: Simplify right side
    665,649.06x = 361,772,313,357.60
  5. Step 5: Solve for x
    x = 361,772,313,357.60/665,649.06
  6. Step 6: Final answer
    x = 543,488.06

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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.