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Finding the Fourth Proportional to 78,992.88, 108,939.60 and 65,542.86

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Solution

The fourth proportional to 78,992.88, 108,939.60 and 65,542.86 is: 90,390.59

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,992.88 : 108,939.60 = 65,542.86 : x
  2. Step 2: Convert to fraction form
    78,992.88/108,939.60 = 65,542.86/x
  3. Step 3: Cross multiply
    78,992.88x = 108,939.60 × 65,542.86
  4. Step 4: Simplify right side
    78,992.88x = 7,140,212,951.26
  5. Step 5: Solve for x
    x = 7,140,212,951.26/78,992.88
  6. Step 6: Final answer
    x = 90,390.59

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.