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Finding the Fourth Proportional to 136,679.70, 188,338.05 and 100,812.90

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Solution

The fourth proportional to 136,679.70, 188,338.05 and 100,812.90 is: 138,915.33

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,679.70 : 188,338.05 = 100,812.90 : x
  2. Step 2: Convert to fraction form
    136,679.70/188,338.05 = 100,812.90/x
  3. Step 3: Cross multiply
    136,679.70x = 188,338.05 × 100,812.90
  4. Step 4: Simplify right side
    136,679.70x = 18,986,905,000.85
  5. Step 5: Solve for x
    x = 18,986,905,000.85/136,679.70
  6. Step 6: Final answer
    x = 138,915.33

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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.