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Finding the Fourth Proportional to 640,985.88, 884,832.88 and 399,387.82

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Solution

The fourth proportional to 640,985.88, 884,832.88 and 399,387.82 is: 551,324.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,985.88 : 884,832.88 = 399,387.82 : x
  2. Step 2: Convert to fraction form
    640,985.88/884,832.88 = 399,387.82/x
  3. Step 3: Cross multiply
    640,985.88x = 884,832.88 × 399,387.82
  4. Step 4: Simplify right side
    640,985.88x = 353,391,476,693.48
  5. Step 5: Solve for x
    x = 353,391,476,693.48/640,985.88
  6. Step 6: Final answer
    x = 551,324.90

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Double scale
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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.