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Finding the Fourth Proportional to 103,633.60, 155,450.40 and 71,976.78

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Solution

The fourth proportional to 103,633.60, 155,450.40 and 71,976.78 is: 107,965.17

Step by Step Solution

  1. Step 1: Write the proportion equation
    103,633.60 : 155,450.40 = 71,976.78 : x
  2. Step 2: Convert to fraction form
    103,633.60/155,450.40 = 71,976.78/x
  3. Step 3: Cross multiply
    103,633.60x = 155,450.40 × 71,976.78
  4. Step 4: Simplify right side
    103,633.60x = 11,188,819,241.71
  5. Step 5: Solve for x
    x = 11,188,819,241.71/103,633.60
  6. Step 6: Final answer
    x = 107,965.17

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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.