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Finding the Fourth Proportional to 138,816.33, 208,310.16 and 54,561.72

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Solution

The fourth proportional to 138,816.33, 208,310.16 and 54,561.72 is: 81,876.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,816.33 : 208,310.16 = 54,561.72 : x
  2. Step 2: Convert to fraction form
    138,816.33/208,310.16 = 54,561.72/x
  3. Step 3: Cross multiply
    138,816.33x = 208,310.16 × 54,561.72
  4. Step 4: Simplify right side
    138,816.33x = 11,365,760,623.08
  5. Step 5: Solve for x
    x = 11,365,760,623.08/138,816.33
  6. Step 6: Final answer
    x = 81,876.25

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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.