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Finding the Fourth Proportional to 78,390.89, 108,137.96 and 49,659.86

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Solution

The fourth proportional to 78,390.89, 108,137.96 and 49,659.86 is: 68,504.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    78,390.89 : 108,137.96 = 49,659.86 : x
  2. Step 2: Convert to fraction form
    78,390.89/108,137.96 = 49,659.86/x
  3. Step 3: Cross multiply
    78,390.89x = 108,137.96 × 49,659.86
  4. Step 4: Simplify right side
    78,390.89x = 5,370,115,954.29
  5. Step 5: Solve for x
    x = 5,370,115,954.29/78,390.89
  6. Step 6: Final answer
    x = 68,504.34

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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.