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Finding the Fourth Proportional to 611,997.40, 917,996.10 and 257,411.80

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Solution

The fourth proportional to 611,997.40, 917,996.10 and 257,411.80 is: 386,117.70

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,997.40 : 917,996.10 = 257,411.80 : x
  2. Step 2: Convert to fraction form
    611,997.40/917,996.10 = 257,411.80/x
  3. Step 3: Cross multiply
    611,997.40x = 917,996.10 × 257,411.80
  4. Step 4: Simplify right side
    611,997.40x = 236,303,028,493.98
  5. Step 5: Solve for x
    x = 236,303,028,493.98/611,997.40
  6. Step 6: Final answer
    x = 386,117.70

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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.