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Finding the Fourth Proportional to 76,912.40, 115,271.40 and 68,553.20

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Solution

The fourth proportional to 76,912.40, 115,271.40 and 68,553.20 is: 102,743.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,912.40 : 115,271.40 = 68,553.20 : x
  2. Step 2: Convert to fraction form
    76,912.40/115,271.40 = 68,553.20/x
  3. Step 3: Cross multiply
    76,912.40x = 115,271.40 × 68,553.20
  4. Step 4: Simplify right side
    76,912.40x = 7,902,223,338.48
  5. Step 5: Solve for x
    x = 7,902,223,338.48/76,912.40
  6. Step 6: Final answer
    x = 102,743.16

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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.