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Finding the Fourth Proportional to 13,721, 18,935.31 and 8,412.74

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Solution

The fourth proportional to 13,721, 18,935.31 and 8,412.74 is: 11,609.78

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,721 : 18,935.31 = 8,412.74 : x
  2. Step 2: Convert to fraction form
    13,721/18,935.31 = 8,412.74/x
  3. Step 3: Cross multiply
    13,721x = 18,935.31 × 8,412.74
  4. Step 4: Simplify right side
    13,721x = 159,297,839.85
  5. Step 5: Solve for x
    x = 159,297,839.85/13,721
  6. Step 6: Final answer
    x = 11,609.78

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.