Home / 21,729.11-29,988.69-13,236.22

Finding the Fourth Proportional to 21,729.11, 29,988.69 and 13,236.22

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Solution

The fourth proportional to 21,729.11, 29,988.69 and 13,236.22 is: 18,267.52

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,729.11 : 29,988.69 = 13,236.22 : x
  2. Step 2: Convert to fraction form
    21,729.11/29,988.69 = 13,236.22/x
  3. Step 3: Cross multiply
    21,729.11x = 29,988.69 × 13,236.22
  4. Step 4: Simplify right side
    21,729.11x = 396,936,898.35
  5. Step 5: Solve for x
    x = 396,936,898.35/21,729.11
  6. Step 6: Final answer
    x = 18,267.52

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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.