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Finding the Fourth Proportional to 80,139.58, 120,209.37 and 20,980.32

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Solution

The fourth proportional to 80,139.58, 120,209.37 and 20,980.32 is: 31,470.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    80,139.58 : 120,209.37 = 20,980.32 : x
  2. Step 2: Convert to fraction form
    80,139.58/120,209.37 = 20,980.32/x
  3. Step 3: Cross multiply
    80,139.58x = 120,209.37 × 20,980.32
  4. Step 4: Simplify right side
    80,139.58x = 2,522,030,520.14
  5. Step 5: Solve for x
    x = 2,522,030,520.14/80,139.58
  6. Step 6: Final answer
    x = 31,470.47

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1.5x scale

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.