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Finding the Fourth Proportional to 139,986.60, 209,979.90 and 100,620.60

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Solution

The fourth proportional to 139,986.60, 209,979.90 and 100,620.60 is: 150,930.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,986.60 : 209,979.90 = 100,620.60 : x
  2. Step 2: Convert to fraction form
    139,986.60/209,979.90 = 100,620.60/x
  3. Step 3: Cross multiply
    139,986.60x = 209,979.90 × 100,620.60
  4. Step 4: Simplify right side
    139,986.60x = 21,128,303,525.94
  5. Step 5: Solve for x
    x = 21,128,303,525.94/139,986.60
  6. Step 6: Final answer
    x = 150,930.90

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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.