Home / 21,150.78-29,189.88-12,198.66

Finding the Fourth Proportional to 21,150.78, 29,189.88 and 12,198.66

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Solution

The fourth proportional to 21,150.78, 29,189.88 and 12,198.66 is: 16,835.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,150.78 : 29,189.88 = 12,198.66 : x
  2. Step 2: Convert to fraction form
    21,150.78/29,189.88 = 12,198.66/x
  3. Step 3: Cross multiply
    21,150.78x = 29,189.88 × 12,198.66
  4. Step 4: Simplify right side
    21,150.78x = 356,077,421.56
  5. Step 5: Solve for x
    x = 356,077,421.56/21,150.78
  6. Step 6: Final answer
    x = 16,835.19

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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.