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Finding the Fourth Proportional to 619,714.28, 855,985.20 and 511,211.80

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Solution

The fourth proportional to 619,714.28, 855,985.20 and 511,211.80 is: 706,115.30

Step by Step Solution

  1. Step 1: Write the proportion equation
    619,714.28 : 855,985.20 = 511,211.80 : x
  2. Step 2: Convert to fraction form
    619,714.28/855,985.20 = 511,211.80/x
  3. Step 3: Cross multiply
    619,714.28x = 855,985.20 × 511,211.80
  4. Step 4: Simplify right side
    619,714.28x = 437,589,734,865.36
  5. Step 5: Solve for x
    x = 437,589,734,865.36/619,714.28
  6. Step 6: Final answer
    x = 706,115.30

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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.