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Finding the Fourth Proportional to 666,418.12, 919,283.31 and 408,420.09

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Solution

The fourth proportional to 666,418.12, 919,283.31 and 408,420.09 is: 563,390.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    666,418.12 : 919,283.31 = 408,420.09 : x
  2. Step 2: Convert to fraction form
    666,418.12/919,283.31 = 408,420.09/x
  3. Step 3: Cross multiply
    666,418.12x = 919,283.31 × 408,420.09
  4. Step 4: Simplify right side
    666,418.12x = 375,453,772,205.70
  5. Step 5: Solve for x
    x = 375,453,772,205.70/666,418.12
  6. Step 6: Final answer
    x = 563,390.70

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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.