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Finding the Fourth Proportional to 136,716.78, 188,638.86 and 79,322.82

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Solution

The fourth proportional to 136,716.78, 188,638.86 and 79,322.82 is: 109,447.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,716.78 : 188,638.86 = 79,322.82 : x
  2. Step 2: Convert to fraction form
    136,716.78/188,638.86 = 79,322.82/x
  3. Step 3: Cross multiply
    136,716.78x = 188,638.86 × 79,322.82
  4. Step 4: Simplify right side
    136,716.78x = 14,963,366,336.79
  5. Step 5: Solve for x
    x = 14,963,366,336.79/136,716.78
  6. Step 6: Final answer
    x = 109,447.91

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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.