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Finding the Fourth Proportional to 71,207.78, 106,833.08 and 21,289.50

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Solution

The fourth proportional to 71,207.78, 106,833.08 and 21,289.50 is: 31,940.65

Step by Step Solution

  1. Step 1: Write the proportion equation
    71,207.78 : 106,833.08 = 21,289.50 : x
  2. Step 2: Convert to fraction form
    71,207.78/106,833.08 = 21,289.50/x
  3. Step 3: Cross multiply
    71,207.78x = 106,833.08 × 21,289.50
  4. Step 4: Simplify right side
    71,207.78x = 2,274,422,856.66
  5. Step 5: Solve for x
    x = 2,274,422,856.66/71,207.78
  6. Step 6: Final answer
    x = 31,940.65

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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.