Home / 21,118.59-29,143.49-11,687.67

Finding the Fourth Proportional to 21,118.59, 29,143.49 and 11,687.67

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Solution

The fourth proportional to 21,118.59, 29,143.49 and 11,687.67 is: 16,128.89

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,118.59 : 29,143.49 = 11,687.67 : x
  2. Step 2: Convert to fraction form
    21,118.59/29,143.49 = 11,687.67/x
  3. Step 3: Cross multiply
    21,118.59x = 29,143.49 × 11,687.67
  4. Step 4: Simplify right side
    21,118.59x = 340,619,435.33
  5. Step 5: Solve for x
    x = 340,619,435.33/21,118.59
  6. Step 6: Final answer
    x = 16,128.89

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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.