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Finding the Fourth Proportional to 76,914.40, 115,274.40 and 68,555.20

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Solution

The fourth proportional to 76,914.40, 115,274.40 and 68,555.20 is: 102,746.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,914.40 : 115,274.40 = 68,555.20 : x
  2. Step 2: Convert to fraction form
    76,914.40/115,274.40 = 68,555.20/x
  3. Step 3: Cross multiply
    76,914.40x = 115,274.40 × 68,555.20
  4. Step 4: Simplify right side
    76,914.40x = 7,902,659,546.88
  5. Step 5: Solve for x
    x = 7,902,659,546.88/76,914.40
  6. Step 6: Final answer
    x = 102,746.16

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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.