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Finding the Fourth Proportional to 640,111.28, 883,346.92 and 353,612.66

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Solution

The fourth proportional to 640,111.28, 883,346.92 and 353,612.66 is: 487,981.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    640,111.28 : 883,346.92 = 353,612.66 : x
  2. Step 2: Convert to fraction form
    640,111.28/883,346.92 = 353,612.66/x
  3. Step 3: Cross multiply
    640,111.28x = 883,346.92 × 353,612.66
  4. Step 4: Simplify right side
    640,111.28x = 312,362,648,783.24
  5. Step 5: Solve for x
    x = 312,362,648,783.24/640,111.28
  6. Step 6: Final answer
    x = 487,981.79

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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.