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Finding the Fourth Proportional to 256,657.91, 354,199.50 and 143,480.66

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Solution

The fourth proportional to 256,657.91, 354,199.50 and 143,480.66 is: 198,009.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    256,657.91 : 354,199.50 = 143,480.66 : x
  2. Step 2: Convert to fraction form
    256,657.91/354,199.50 = 143,480.66/x
  3. Step 3: Cross multiply
    256,657.91x = 354,199.50 × 143,480.66
  4. Step 4: Simplify right side
    256,657.91x = 50,820,776,260.67
  5. Step 5: Solve for x
    x = 50,820,776,260.67/256,657.91
  6. Step 6: Final answer
    x = 198,009.78

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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.