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Finding the Fourth Proportional to 611,784.30, 917,676.45 and 257,490.30

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Solution

The fourth proportional to 611,784.30, 917,676.45 and 257,490.30 is: 386,235.45

Step by Step Solution

  1. Step 1: Write the proportion equation
    611,784.30 : 917,676.45 = 257,490.30 : x
  2. Step 2: Convert to fraction form
    611,784.30/917,676.45 = 257,490.30/x
  3. Step 3: Cross multiply
    611,784.30x = 917,676.45 × 257,490.30
  4. Step 4: Simplify right side
    611,784.30x = 236,292,784,413.44
  5. Step 5: Solve for x
    x = 236,292,784,413.44/611,784.30
  6. Step 6: Final answer
    x = 386,235.45

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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.