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Finding the Fourth Proportional to 86,005.08, 128,949.06 and 43,781.40

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Solution

The fourth proportional to 86,005.08, 128,949.06 and 43,781.40 is: 65,642.29

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,005.08 : 128,949.06 = 43,781.40 : x
  2. Step 2: Convert to fraction form
    86,005.08/128,949.06 = 43,781.40/x
  3. Step 3: Cross multiply
    86,005.08x = 128,949.06 × 43,781.40
  4. Step 4: Simplify right side
    86,005.08x = 5,645,570,375.48
  5. Step 5: Solve for x
    x = 5,645,570,375.48/86,005.08
  6. Step 6: Final answer
    x = 65,642.29

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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.