Home / 21,120.10-29,142.85-12,620.43

Finding the Fourth Proportional to 21,120.10, 29,142.85 and 12,620.43

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Solution

The fourth proportional to 21,120.10, 29,142.85 and 12,620.43 is: 17,414.47

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.10 : 29,142.85 = 12,620.43 : x
  2. Step 2: Convert to fraction form
    21,120.10/29,142.85 = 12,620.43/x
  3. Step 3: Cross multiply
    21,120.10x = 29,142.85 × 12,620.43
  4. Step 4: Simplify right side
    21,120.10x = 367,795,298.43
  5. Step 5: Solve for x
    x = 367,795,298.43/21,120.10
  6. Step 6: Final answer
    x = 17,414.47

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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.