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Finding the Fourth Proportional to 50,721, 69,995.22 and 28,365

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Solution

The fourth proportional to 50,721, 69,995.22 and 28,365 is: 39,143.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    50,721 : 69,995.22 = 28,365 : x
  2. Step 2: Convert to fraction form
    50,721/69,995.22 = 28,365/x
  3. Step 3: Cross multiply
    50,721x = 69,995.22 × 28,365
  4. Step 4: Simplify right side
    50,721x = 1,985,414,415.30
  5. Step 5: Solve for x
    x = 1,985,414,415.30/50,721
  6. Step 6: Final answer
    x = 39,143.83

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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.