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Finding the Fourth Proportional to 136,644.74, 188,518.90 and 79,251.88

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Solution

The fourth proportional to 136,644.74, 188,518.90 and 79,251.88 is: 109,338.11

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,644.74 : 188,518.90 = 79,251.88 : x
  2. Step 2: Convert to fraction form
    136,644.74/188,518.90 = 79,251.88/x
  3. Step 3: Cross multiply
    136,644.74x = 188,518.90 × 79,251.88
  4. Step 4: Simplify right side
    136,644.74x = 14,940,477,240.53
  5. Step 5: Solve for x
    x = 14,940,477,240.53/136,644.74
  6. Step 6: Final answer
    x = 109,338.11

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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.