Home / 21,120.45-29,143.33-12,620.78

Finding the Fourth Proportional to 21,120.45, 29,143.33 and 12,620.78

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Solution

The fourth proportional to 21,120.45, 29,143.33 and 12,620.78 is: 17,414.94

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,120.45 : 29,143.33 = 12,620.78 : x
  2. Step 2: Convert to fraction form
    21,120.45/29,143.33 = 12,620.78/x
  3. Step 3: Cross multiply
    21,120.45x = 29,143.33 × 12,620.78
  4. Step 4: Simplify right side
    21,120.45x = 367,811,347.58
  5. Step 5: Solve for x
    x = 367,811,347.58/21,120.45
  6. Step 6: Final answer
    x = 17,414.94

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1.5x scale

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.