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Finding the Fourth Proportional to 139,393.28, 209,103.60 and 80,114.24

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Solution

The fourth proportional to 139,393.28, 209,103.60 and 80,114.24 is: 120,179.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,393.28 : 209,103.60 = 80,114.24 : x
  2. Step 2: Convert to fraction form
    139,393.28/209,103.60 = 80,114.24/x
  3. Step 3: Cross multiply
    139,393.28x = 209,103.60 × 80,114.24
  4. Step 4: Simplify right side
    139,393.28x = 16,752,175,995.26
  5. Step 5: Solve for x
    x = 16,752,175,995.26/139,393.28
  6. Step 6: Final answer
    x = 120,179.22

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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.