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Finding the Fourth Proportional to 136,687.70, 188,349.07 and 100,820.90

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Solution

The fourth proportional to 136,687.70, 188,349.07 and 100,820.90 is: 138,926.35

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,687.70 : 188,349.07 = 100,820.90 : x
  2. Step 2: Convert to fraction form
    136,687.70/188,349.07 = 100,820.90/x
  3. Step 3: Cross multiply
    136,687.70x = 188,349.07 × 100,820.90
  4. Step 4: Simplify right side
    136,687.70x = 18,989,522,751.56
  5. Step 5: Solve for x
    x = 18,989,522,751.56/136,687.70
  6. Step 6: Final answer
    x = 138,926.35

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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.