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Finding the Fourth Proportional to 67,874.90, 101,821.95 and 21,122.90

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Solution

The fourth proportional to 67,874.90, 101,821.95 and 21,122.90 is: 31,687.34

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,874.90 : 101,821.95 = 21,122.90 : x
  2. Step 2: Convert to fraction form
    67,874.90/101,821.95 = 21,122.90/x
  3. Step 3: Cross multiply
    67,874.90x = 101,821.95 × 21,122.90
  4. Step 4: Simplify right side
    67,874.90x = 2,150,774,867.66
  5. Step 5: Solve for x
    x = 2,150,774,867.66/67,874.90
  6. Step 6: Final answer
    x = 31,687.34

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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.