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Finding the Fourth Proportional to 12,489.80, 17,256.18 and 12,366.92

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Solution

The fourth proportional to 12,489.80, 17,256.18 and 12,366.92 is: 17,086.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,489.80 : 17,256.18 = 12,366.92 : x
  2. Step 2: Convert to fraction form
    12,489.80/17,256.18 = 12,366.92/x
  3. Step 3: Cross multiply
    12,489.80x = 17,256.18 × 12,366.92
  4. Step 4: Simplify right side
    12,489.80x = 213,405,797.57
  5. Step 5: Solve for x
    x = 213,405,797.57/12,489.80
  6. Step 6: Final answer
    x = 17,086.41

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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.