Home / 21,119.22-29,145.89-11,687.78

Finding the Fourth Proportional to 21,119.22, 29,145.89 and 11,687.78

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Solution

The fourth proportional to 21,119.22, 29,145.89 and 11,687.78 is: 16,129.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,119.22 : 29,145.89 = 11,687.78 : x
  2. Step 2: Convert to fraction form
    21,119.22/29,145.89 = 11,687.78/x
  3. Step 3: Cross multiply
    21,119.22x = 29,145.89 × 11,687.78
  4. Step 4: Simplify right side
    21,119.22x = 340,650,750.22
  5. Step 5: Solve for x
    x = 340,650,750.22/21,119.22
  6. Step 6: Final answer
    x = 16,129.89

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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.