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Finding the Fourth Proportional to 136,872.60, 205,424.10 and 66,811.80

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Solution

The fourth proportional to 136,872.60, 205,424.10 and 66,811.80 is: 100,273.93

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,872.60 : 205,424.10 = 66,811.80 : x
  2. Step 2: Convert to fraction form
    136,872.60/205,424.10 = 66,811.80/x
  3. Step 3: Cross multiply
    136,872.60x = 205,424.10 × 66,811.80
  4. Step 4: Simplify right side
    136,872.60x = 13,724,753,884.38
  5. Step 5: Solve for x
    x = 13,724,753,884.38/136,872.60
  6. Step 6: Final answer
    x = 100,273.93

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.