Home / 21,119.08-29,143.92-11,687.72

Finding the Fourth Proportional to 21,119.08, 29,143.92 and 11,687.72

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Solution

The fourth proportional to 21,119.08, 29,143.92 and 11,687.72 is: 16,128.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,119.08 : 29,143.92 = 11,687.72 : x
  2. Step 2: Convert to fraction form
    21,119.08/29,143.92 = 11,687.72/x
  3. Step 3: Cross multiply
    21,119.08x = 29,143.92 × 11,687.72
  4. Step 4: Simplify right side
    21,119.08x = 340,625,976.66
  5. Step 5: Solve for x
    x = 340,625,976.66/21,119.08
  6. Step 6: Final answer
    x = 16,128.83

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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.