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Finding the Fourth Proportional to 427,809.70, 641,714.55 and 405,000.10

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Solution

The fourth proportional to 427,809.70, 641,714.55 and 405,000.10 is: 607,500.15

Step by Step Solution

  1. Step 1: Write the proportion equation
    427,809.70 : 641,714.55 = 405,000.10 : x
  2. Step 2: Convert to fraction form
    427,809.70/641,714.55 = 405,000.10/x
  3. Step 3: Cross multiply
    427,809.70x = 641,714.55 × 405,000.10
  4. Step 4: Simplify right side
    427,809.70x = 259,894,456,921.46
  5. Step 5: Solve for x
    x = 259,894,456,921.46/427,809.70
  6. Step 6: Final answer
    x = 607,500.15

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Double scale
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Similar ratio
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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.