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Finding the Fourth Proportional to 15,011.71, 20,717.91 and 12,489.37

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Solution

The fourth proportional to 15,011.71, 20,717.91 and 12,489.37 is: 17,236.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,011.71 : 20,717.91 = 12,489.37 : x
  2. Step 2: Convert to fraction form
    15,011.71/20,717.91 = 12,489.37/x
  3. Step 3: Cross multiply
    15,011.71x = 20,717.91 × 12,489.37
  4. Step 4: Simplify right side
    15,011.71x = 258,753,540.03
  5. Step 5: Solve for x
    x = 258,753,540.03/15,011.71
  6. Step 6: Final answer
    x = 17,236.79

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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.