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Finding the Fourth Proportional to 136,329.76, 188,086.37 and 78,937.76

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Solution

The fourth proportional to 136,329.76, 188,086.37 and 78,937.76 is: 108,905.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,329.76 : 188,086.37 = 78,937.76 : x
  2. Step 2: Convert to fraction form
    136,329.76/188,086.37 = 78,937.76/x
  3. Step 3: Cross multiply
    136,329.76x = 188,086.37 × 78,937.76
  4. Step 4: Simplify right side
    136,329.76x = 14,847,115,991.24
  5. Step 5: Solve for x
    x = 14,847,115,991.24/136,329.76
  6. Step 6: Final answer
    x = 108,905.91

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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.