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Finding the Fourth Proportional to 85,939.80, 128,956.68 and 33,351.36

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Solution

The fourth proportional to 85,939.80, 128,956.68 and 33,351.36 is: 50,045.27

Step by Step Solution

  1. Step 1: Write the proportion equation
    85,939.80 : 128,956.68 = 33,351.36 : x
  2. Step 2: Convert to fraction form
    85,939.80/128,956.68 = 33,351.36/x
  3. Step 3: Cross multiply
    85,939.80x = 128,956.68 × 33,351.36
  4. Step 4: Simplify right side
    85,939.80x = 4,300,880,659.08
  5. Step 5: Solve for x
    x = 4,300,880,659.08/85,939.80
  6. Step 6: Final answer
    x = 50,045.27

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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.