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Finding the Fourth Proportional to 139,968.80, 210,171.90 and 80,919.80

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Solution

The fourth proportional to 139,968.80, 210,171.90 and 80,919.80 is: 121,506.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,968.80 : 210,171.90 = 80,919.80 : x
  2. Step 2: Convert to fraction form
    139,968.80/210,171.90 = 80,919.80/x
  3. Step 3: Cross multiply
    139,968.80x = 210,171.90 × 80,919.80
  4. Step 4: Simplify right side
    139,968.80x = 17,007,068,113.62
  5. Step 5: Solve for x
    x = 17,007,068,113.62/139,968.80
  6. Step 6: Final answer
    x = 121,506.14

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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.