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Finding the Fourth Proportional to 643,874.49, 888,557.25 and 353,512.86

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Solution

The fourth proportional to 643,874.49, 888,557.25 and 353,512.86 is: 487,853.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    643,874.49 : 888,557.25 = 353,512.86 : x
  2. Step 2: Convert to fraction form
    643,874.49/888,557.25 = 353,512.86/x
  3. Step 3: Cross multiply
    643,874.49x = 888,557.25 × 353,512.86
  4. Step 4: Simplify right side
    643,874.49x = 314,116,414,721.24
  5. Step 5: Solve for x
    x = 314,116,414,721.24/643,874.49
  6. Step 6: Final answer
    x = 487,853.49

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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.