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Finding the Fourth Proportional to 67,912.80, 101,878.91 and 21,169.32

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Solution

The fourth proportional to 67,912.80, 101,878.91 and 21,169.32 is: 31,757.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    67,912.80 : 101,878.91 = 21,169.32 : x
  2. Step 2: Convert to fraction form
    67,912.80/101,878.91 = 21,169.32/x
  3. Step 3: Cross multiply
    67,912.80x = 101,878.91 × 21,169.32
  4. Step 4: Simplify right side
    67,912.80x = 2,156,707,141.19
  5. Step 5: Solve for x
    x = 2,156,707,141.19/67,912.80
  6. Step 6: Final answer
    x = 31,757.01

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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.