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Finding the Fourth Proportional to 12,455, 18,685.46 and 4,247

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Solution

The fourth proportional to 12,455, 18,685.46 and 4,247 is: 6,371.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,455 : 18,685.46 = 4,247 : x
  2. Step 2: Convert to fraction form
    12,455/18,685.46 = 4,247/x
  3. Step 3: Cross multiply
    12,455x = 18,685.46 × 4,247
  4. Step 4: Simplify right side
    12,455x = 79,357,148.62
  5. Step 5: Solve for x
    x = 79,357,148.62/12,455
  6. Step 6: Final answer
    x = 6,371.51

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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.