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Finding the Fourth Proportional to 20,609.80, 30,904.35 and 10,080.61

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Solution

The fourth proportional to 20,609.80, 30,904.35 and 10,080.61 is: 15,115.85

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,609.80 : 30,904.35 = 10,080.61 : x
  2. Step 2: Convert to fraction form
    20,609.80/30,904.35 = 10,080.61/x
  3. Step 3: Cross multiply
    20,609.80x = 30,904.35 × 10,080.61
  4. Step 4: Simplify right side
    20,609.80x = 311,534,699.65
  5. Step 5: Solve for x
    x = 311,534,699.65/20,609.80
  6. Step 6: Final answer
    x = 15,115.85

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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.