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Finding the Fourth Proportional to 77,644.80, 116,467.20 and 68,428.80

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Solution

The fourth proportional to 77,644.80, 116,467.20 and 68,428.80 is: 102,643.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,644.80 : 116,467.20 = 68,428.80 : x
  2. Step 2: Convert to fraction form
    77,644.80/116,467.20 = 68,428.80/x
  3. Step 3: Cross multiply
    77,644.80x = 116,467.20 × 68,428.80
  4. Step 4: Simplify right side
    77,644.80x = 7,969,710,735.36
  5. Step 5: Solve for x
    x = 7,969,710,735.36/77,644.80
  6. Step 6: Final answer
    x = 102,643.20

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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.