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Finding the Fourth Proportional to 12,489.99, 17,236.20 and 6,824.79

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Solution

The fourth proportional to 12,489.99, 17,236.20 and 6,824.79 is: 9,418.22

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.99 : 17,236.20 = 6,824.79 : x
  2. Step 2: Convert to fraction form
    12,489.99/17,236.20 = 6,824.79/x
  3. Step 3: Cross multiply
    12,489.99x = 17,236.20 × 6,824.79
  4. Step 4: Simplify right side
    12,489.99x = 117,633,445.40
  5. Step 5: Solve for x
    x = 117,633,445.40/12,489.99
  6. Step 6: Final answer
    x = 9,418.22

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Similar ratio
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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.