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Finding the Fourth Proportional to 79,940.61, 119,886.87 and 65,865.75

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Solution

The fourth proportional to 79,940.61, 119,886.87 and 65,865.75 is: 98,778.81

Step by Step Solution

  1. Step 1: Write the proportion equation
    79,940.61 : 119,886.87 = 65,865.75 : x
  2. Step 2: Convert to fraction form
    79,940.61/119,886.87 = 65,865.75/x
  3. Step 3: Cross multiply
    79,940.61x = 119,886.87 × 65,865.75
  4. Step 4: Simplify right side
    79,940.61x = 7,896,438,607.70
  5. Step 5: Solve for x
    x = 7,896,438,607.70/79,940.61
  6. Step 6: Final answer
    x = 98,778.81

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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.