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Finding the Fourth Proportional to 139,388.48, 208,939.68 and 55,114.88

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Solution

The fourth proportional to 139,388.48, 208,939.68 and 55,114.88 is: 82,615.76

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,388.48 : 208,939.68 = 55,114.88 : x
  2. Step 2: Convert to fraction form
    139,388.48/208,939.68 = 55,114.88/x
  3. Step 3: Cross multiply
    139,388.48x = 208,939.68 × 55,114.88
  4. Step 4: Simplify right side
    139,388.48x = 11,515,685,390.44
  5. Step 5: Solve for x
    x = 11,515,685,390.44/139,388.48
  6. Step 6: Final answer
    x = 82,615.76

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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.