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Finding the Fourth Proportional to 136,688.70, 188,350.45 and 100,821.90

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Solution

The fourth proportional to 136,688.70, 188,350.45 and 100,821.90 is: 138,927.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,688.70 : 188,350.45 = 100,821.90 : x
  2. Step 2: Convert to fraction form
    136,688.70/188,350.45 = 100,821.90/x
  3. Step 3: Cross multiply
    136,688.70x = 188,350.45 × 100,821.90
  4. Step 4: Simplify right side
    136,688.70x = 18,989,850,234.86
  5. Step 5: Solve for x
    x = 18,989,850,234.86/136,688.70
  6. Step 6: Final answer
    x = 138,927.73

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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.