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Finding the Fourth Proportional to 639,128.76, 881,997.06 and 352,648.86

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Solution

The fourth proportional to 639,128.76, 881,997.06 and 352,648.86 is: 486,655.08

Step by Step Solution

  1. Step 1: Write the proportion equation
    639,128.76 : 881,997.06 = 352,648.86 : x
  2. Step 2: Convert to fraction form
    639,128.76/881,997.06 = 352,648.86/x
  3. Step 3: Cross multiply
    639,128.76x = 881,997.06 × 352,648.86
  4. Step 4: Simplify right side
    639,128.76x = 311,035,257,732.35
  5. Step 5: Solve for x
    x = 311,035,257,732.35/639,128.76
  6. Step 6: Final answer
    x = 486,655.08

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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.