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Finding the Fourth Proportional to 128,999.20, 193,207.20 and 76,511.20

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Solution

The fourth proportional to 128,999.20, 193,207.20 and 76,511.20 is: 114,593.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    128,999.20 : 193,207.20 = 76,511.20 : x
  2. Step 2: Convert to fraction form
    128,999.20/193,207.20 = 76,511.20/x
  3. Step 3: Cross multiply
    128,999.20x = 193,207.20 × 76,511.20
  4. Step 4: Simplify right side
    128,999.20x = 14,782,514,720.64
  5. Step 5: Solve for x
    x = 14,782,514,720.64/128,999.20
  6. Step 6: Final answer
    x = 114,593.85

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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.