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Finding the Fourth Proportional to 136,940.43, 205,269.71 and 66,732.87

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Solution

The fourth proportional to 136,940.43, 205,269.71 and 66,732.87 is: 100,030.62

Step by Step Solution

  1. Step 1: Write the proportion equation
    136,940.43 : 205,269.71 = 66,732.87 : x
  2. Step 2: Convert to fraction form
    136,940.43/205,269.71 = 66,732.87/x
  3. Step 3: Cross multiply
    136,940.43x = 205,269.71 × 66,732.87
  4. Step 4: Simplify right side
    136,940.43x = 13,698,236,538.70
  5. Step 5: Solve for x
    x = 13,698,236,538.70/136,940.43
  6. Step 6: Final answer
    x = 100,030.62

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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.