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Finding the Fourth Proportional to 263,316.15, 395,015.20 and 85,781.84

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Solution

The fourth proportional to 263,316.15, 395,015.20 and 85,781.84 is: 128,686.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    263,316.15 : 395,015.20 = 85,781.84 : x
  2. Step 2: Convert to fraction form
    263,316.15/395,015.20 = 85,781.84/x
  3. Step 3: Cross multiply
    263,316.15x = 395,015.20 × 85,781.84
  4. Step 4: Simplify right side
    263,316.15x = 33,885,128,494.44
  5. Step 5: Solve for x
    x = 33,885,128,494.44/263,316.15
  6. Step 6: Final answer
    x = 128,686.10

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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.