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Finding the Fourth Proportional to 81,131.20, 121,696.80 and 78,020.80

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Solution

The fourth proportional to 81,131.20, 121,696.80 and 78,020.80 is: 117,031.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    81,131.20 : 121,696.80 = 78,020.80 : x
  2. Step 2: Convert to fraction form
    81,131.20/121,696.80 = 78,020.80/x
  3. Step 3: Cross multiply
    81,131.20x = 121,696.80 × 78,020.80
  4. Step 4: Simplify right side
    81,131.20x = 9,494,881,693.44
  5. Step 5: Solve for x
    x = 9,494,881,693.44/81,131.20
  6. Step 6: Final answer
    x = 117,031.20

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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.