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Finding the Fourth Proportional to 115,129.60, 172,694.40 and 68,358.40

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Solution

The fourth proportional to 115,129.60, 172,694.40 and 68,358.40 is: 102,537.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    115,129.60 : 172,694.40 = 68,358.40 : x
  2. Step 2: Convert to fraction form
    115,129.60/172,694.40 = 68,358.40/x
  3. Step 3: Cross multiply
    115,129.60x = 172,694.40 × 68,358.40
  4. Step 4: Simplify right side
    115,129.60x = 11,805,112,872.96
  5. Step 5: Solve for x
    x = 11,805,112,872.96/115,129.60
  6. Step 6: Final answer
    x = 102,537.60

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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.