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Finding the Fourth Proportional to 76,991.60, 115,429.80 and 41,970.80

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Solution

The fourth proportional to 76,991.60, 115,429.80 and 41,970.80 is: 62,924.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    76,991.60 : 115,429.80 = 41,970.80 : x
  2. Step 2: Convert to fraction form
    76,991.60/115,429.80 = 41,970.80/x
  3. Step 3: Cross multiply
    76,991.60x = 115,429.80 × 41,970.80
  4. Step 4: Simplify right side
    76,991.60x = 4,844,681,049.84
  5. Step 5: Solve for x
    x = 4,844,681,049.84/76,991.60
  6. Step 6: Final answer
    x = 62,924.80

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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.