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Finding the Fourth Proportional to 81,138.72, 121,530.06 and 66,939.03

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Solution

The fourth proportional to 81,138.72, 121,530.06 and 66,939.03 is: 100,261.68

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,138.72 : 121,530.06 = 66,939.03 : x
  2. Step 2: Convert to fraction form
    81,138.72/121,530.06 = 66,939.03/x
  3. Step 3: Cross multiply
    81,138.72x = 121,530.06 × 66,939.03
  4. Step 4: Simplify right side
    81,138.72x = 8,135,104,332.24
  5. Step 5: Solve for x
    x = 8,135,104,332.24/81,138.72
  6. Step 6: Final answer
    x = 100,261.68

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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.