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Finding the Fourth Proportional to 21,911.87, 30,244.59 and 12,962.49

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Solution

The fourth proportional to 21,911.87, 30,244.59 and 12,962.49 is: 17,891.91

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,911.87 : 30,244.59 = 12,962.49 : x
  2. Step 2: Convert to fraction form
    21,911.87/30,244.59 = 12,962.49/x
  3. Step 3: Cross multiply
    21,911.87x = 30,244.59 × 12,962.49
  4. Step 4: Simplify right side
    21,911.87x = 392,045,195.43
  5. Step 5: Solve for x
    x = 392,045,195.43/21,911.87
  6. Step 6: Final answer
    x = 17,891.91

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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.