Home / 139,986.20-209,979.30-80,937.20

Finding the Fourth Proportional to 139,986.20, 209,979.30 and 80,937.20

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Solution

The fourth proportional to 139,986.20, 209,979.30 and 80,937.20 is: 121,405.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    139,986.20 : 209,979.30 = 80,937.20 : x
  2. Step 2: Convert to fraction form
    139,986.20/209,979.30 = 80,937.20/x
  3. Step 3: Cross multiply
    139,986.20x = 209,979.30 × 80,937.20
  4. Step 4: Simplify right side
    139,986.20x = 16,995,136,599.96
  5. Step 5: Solve for x
    x = 16,995,136,599.96/139,986.20
  6. Step 6: Final answer
    x = 121,405.80

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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.