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Finding the Fourth Proportional to 18,992.79, 26,207.28 and 11,921.49

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Solution

The fourth proportional to 18,992.79, 26,207.28 and 11,921.49 is: 16,449.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,992.79 : 26,207.28 = 11,921.49 : x
  2. Step 2: Convert to fraction form
    18,992.79/26,207.28 = 11,921.49/x
  3. Step 3: Cross multiply
    18,992.79x = 26,207.28 × 11,921.49
  4. Step 4: Simplify right side
    18,992.79x = 312,429,826.45
  5. Step 5: Solve for x
    x = 312,429,826.45/18,992.79
  6. Step 6: Final answer
    x = 16,449.92

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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.