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Finding the Fourth Proportional to 21,992.58, 30,349.81 and 11,920.97

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Solution

The fourth proportional to 21,992.58, 30,349.81 and 11,920.97 is: 16,450.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,992.58 : 30,349.81 = 11,920.97 : x
  2. Step 2: Convert to fraction form
    21,992.58/30,349.81 = 11,920.97/x
  3. Step 3: Cross multiply
    21,992.58x = 30,349.81 × 11,920.97
  4. Step 4: Simplify right side
    21,992.58x = 361,799,265.29
  5. Step 5: Solve for x
    x = 361,799,265.29/21,992.58
  6. Step 6: Final answer
    x = 16,450.97

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Double scale
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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.