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Finding the Fourth Proportional to 20,080, 30,120.72 and 6,228.64

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Solution

The fourth proportional to 20,080, 30,120.72 and 6,228.64 is: 9,343.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,080 : 30,120.72 = 6,228.64 : x
  2. Step 2: Convert to fraction form
    20,080/30,120.72 = 6,228.64/x
  3. Step 3: Cross multiply
    20,080x = 30,120.72 × 6,228.64
  4. Step 4: Simplify right side
    20,080x = 187,611,121.42
  5. Step 5: Solve for x
    x = 187,611,121.42/20,080
  6. Step 6: Final answer
    x = 9,343.18

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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.