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Finding the Fourth Proportional to 82,129.60, 123,021.60 and 68,305.60

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Solution

The fourth proportional to 82,129.60, 123,021.60 and 68,305.60 is: 102,314.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    82,129.60 : 123,021.60 = 68,305.60 : x
  2. Step 2: Convert to fraction form
    82,129.60/123,021.60 = 68,305.60/x
  3. Step 3: Cross multiply
    82,129.60x = 123,021.60 × 68,305.60
  4. Step 4: Simplify right side
    82,129.60x = 8,403,064,200.96
  5. Step 5: Solve for x
    x = 8,403,064,200.96/82,129.60
  6. Step 6: Final answer
    x = 102,314.69

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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.