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Finding the Fourth Proportional to 81,378.90, 121,878.81 and 79,136.69

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Solution

The fourth proportional to 81,378.90, 121,878.81 and 79,136.69 is: 118,520.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,378.90 : 121,878.81 = 79,136.69 : x
  2. Step 2: Convert to fraction form
    81,378.90/121,878.81 = 79,136.69/x
  3. Step 3: Cross multiply
    81,378.90x = 121,878.81 × 79,136.69
  4. Step 4: Simplify right side
    81,378.90x = 9,645,084,995.14
  5. Step 5: Solve for x
    x = 9,645,084,995.14/81,378.90
  6. Step 6: Final answer
    x = 118,520.71

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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.