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Finding the Fourth Proportional to 621,578.32, 857,467.56 and 392,419.60

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Solution

The fourth proportional to 621,578.32, 857,467.56 and 392,419.60 is: 541,343.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    621,578.32 : 857,467.56 = 392,419.60 : x
  2. Step 2: Convert to fraction form
    621,578.32/857,467.56 = 392,419.60/x
  3. Step 3: Cross multiply
    621,578.32x = 857,467.56 × 392,419.60
  4. Step 4: Simplify right side
    621,578.32x = 336,487,076,908.18
  5. Step 5: Solve for x
    x = 336,487,076,908.18/621,578.32
  6. Step 6: Final answer
    x = 541,343.01

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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.