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Finding the Fourth Proportional to 12,445, 18,668.58 and 3,211

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Solution

The fourth proportional to 12,445, 18,668.58 and 3,211 is: 4,816.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,445 : 18,668.58 = 3,211 : x
  2. Step 2: Convert to fraction form
    12,445/18,668.58 = 3,211/x
  3. Step 3: Cross multiply
    12,445x = 18,668.58 × 3,211
  4. Step 4: Simplify right side
    12,445x = 59,944,810.38
  5. Step 5: Solve for x
    x = 59,944,810.38/12,445
  6. Step 6: Final answer
    x = 4,816.78

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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.