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Finding the Fourth Proportional to 30,390, 45,606.60 and 11,922

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Solution

The fourth proportional to 30,390, 45,606.60 and 11,922 is: 17,891.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    30,390 : 45,606.60 = 11,922 : x
  2. Step 2: Convert to fraction form
    30,390/45,606.60 = 11,922/x
  3. Step 3: Cross multiply
    30,390x = 45,606.60 × 11,922
  4. Step 4: Simplify right side
    30,390x = 543,721,885.20
  5. Step 5: Solve for x
    x = 543,721,885.20/30,390
  6. Step 6: Final answer
    x = 17,891.47

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Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.