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Finding the Fourth Proportional to 139,728.43, 209,455.96 and 55,460.59

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Solution

The fourth proportional to 139,728.43, 209,455.96 and 55,460.59 is: 83,136.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,728.43 : 209,455.96 = 55,460.59 : x
  2. Step 2: Convert to fraction form
    139,728.43/209,455.96 = 55,460.59/x
  3. Step 3: Cross multiply
    139,728.43x = 209,455.96 × 55,460.59
  4. Step 4: Simplify right side
    139,728.43x = 11,616,551,120.62
  5. Step 5: Solve for x
    x = 11,616,551,120.62/139,728.43
  6. Step 6: Final answer
    x = 83,136.63

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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.