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Finding the Fourth Proportional to 85,778.52, 128,661.60 and 26,612.66

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Solution

The fourth proportional to 85,778.52, 128,661.60 and 26,612.66 is: 39,917.07

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,778.52 : 128,661.60 = 26,612.66 : x
  2. Step 2: Convert to fraction form
    85,778.52/128,661.60 = 26,612.66/x
  3. Step 3: Cross multiply
    85,778.52x = 128,661.60 × 26,612.66
  4. Step 4: Simplify right side
    85,778.52x = 3,424,027,415.86
  5. Step 5: Solve for x
    x = 3,424,027,415.86/85,778.52
  6. Step 6: Final answer
    x = 39,917.07

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.