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Finding the Fourth Proportional to 29,139, 40,212.30 and 15,891

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Solution

The fourth proportional to 29,139, 40,212.30 and 15,891 is: 21,929.84

Step by Step Solution

  1. Step 1: Write the proportion equation
    29,139 : 40,212.30 = 15,891 : x
  2. Step 2: Convert to fraction form
    29,139/40,212.30 = 15,891/x
  3. Step 3: Cross multiply
    29,139x = 40,212.30 × 15,891
  4. Step 4: Simplify right side
    29,139x = 639,013,659.30
  5. Step 5: Solve for x
    x = 639,013,659.30/29,139
  6. Step 6: Final answer
    x = 21,929.84

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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.