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Finding the Fourth Proportional to 138,165.30, 207,357.30 and 53,965.80

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Solution

The fourth proportional to 138,165.30, 207,357.30 and 53,965.80 is: 80,991.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    138,165.30 : 207,357.30 = 53,965.80 : x
  2. Step 2: Convert to fraction form
    138,165.30/207,357.30 = 53,965.80/x
  3. Step 3: Cross multiply
    138,165.30x = 207,357.30 × 53,965.80
  4. Step 4: Simplify right side
    138,165.30x = 11,190,202,580.34
  5. Step 5: Solve for x
    x = 11,190,202,580.34/138,165.30
  6. Step 6: Final answer
    x = 80,991.41

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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.