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Finding the Fourth Proportional to 86,015.94, 129,018.78 and 26,843.28

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Solution

The fourth proportional to 86,015.94, 129,018.78 and 26,843.28 is: 40,263.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    86,015.94 : 129,018.78 = 26,843.28 : x
  2. Step 2: Convert to fraction form
    86,015.94/129,018.78 = 26,843.28/x
  3. Step 3: Cross multiply
    86,015.94x = 129,018.78 × 26,843.28
  4. Step 4: Simplify right side
    86,015.94x = 3,463,287,236.80
  5. Step 5: Solve for x
    x = 3,463,287,236.80/86,015.94
  6. Step 6: Final answer
    x = 40,263.32

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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.