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Finding the Fourth Proportional to 665,009.80, 997,514.70 and 399,070.60

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Solution

The fourth proportional to 665,009.80, 997,514.70 and 399,070.60 is: 598,605.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    665,009.80 : 997,514.70 = 399,070.60 : x
  2. Step 2: Convert to fraction form
    665,009.80/997,514.70 = 399,070.60/x
  3. Step 3: Cross multiply
    665,009.80x = 997,514.70 × 399,070.60
  4. Step 4: Simplify right side
    665,009.80x = 398,078,789,837.82
  5. Step 5: Solve for x
    x = 398,078,789,837.82/665,009.80
  6. Step 6: Final answer
    x = 598,605.90

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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.