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Finding the Fourth Proportional to 77,120.60, 115,940.10 and 65,715.80

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Solution

The fourth proportional to 77,120.60, 115,940.10 and 65,715.80 is: 98,794.57

Step by Step Solution

  1. Step 1: Write the proportion equation
    77,120.60 : 115,940.10 = 65,715.80 : x
  2. Step 2: Convert to fraction form
    77,120.60/115,940.10 = 65,715.80/x
  3. Step 3: Cross multiply
    77,120.60x = 115,940.10 × 65,715.80
  4. Step 4: Simplify right side
    77,120.60x = 7,619,096,423.58
  5. Step 5: Solve for x
    x = 7,619,096,423.58/77,120.60
  6. Step 6: Final answer
    x = 98,794.57

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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.