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Finding the Fourth Proportional to 136,334.70, 188,175.04 and 78,964.78

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Solution

The fourth proportional to 136,334.70, 188,175.04 and 78,964.78 is: 108,990.60

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,334.70 : 188,175.04 = 78,964.78 : x
  2. Step 2: Convert to fraction form
    136,334.70/188,175.04 = 78,964.78/x
  3. Step 3: Cross multiply
    136,334.70x = 188,175.04 × 78,964.78
  4. Step 4: Simplify right side
    136,334.70x = 14,859,200,635.09
  5. Step 5: Solve for x
    x = 14,859,200,635.09/136,334.70
  6. Step 6: Final answer
    x = 108,990.60

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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.