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Finding the Fourth Proportional to 640,985.82, 884,832.79 and 399,387.76

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Solution

The fourth proportional to 640,985.82, 884,832.79 and 399,387.76 is: 551,324.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,985.82 : 884,832.79 = 399,387.76 : x
  2. Step 2: Convert to fraction form
    640,985.82/884,832.79 = 399,387.76/x
  3. Step 3: Cross multiply
    640,985.82x = 884,832.79 × 399,387.76
  4. Step 4: Simplify right side
    640,985.82x = 353,391,383,760.57
  5. Step 5: Solve for x
    x = 353,391,383,760.57/640,985.82
  6. Step 6: Final answer
    x = 551,324.81

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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.