Home / 15,729.12-21,680.98-11,939.96

Finding the Fourth Proportional to 15,729.12, 21,680.98 and 11,939.96

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Solution

The fourth proportional to 15,729.12, 21,680.98 and 11,939.96 is: 16,458.01

Step by Step Solution

  1. Step 1: Write the proportion equation
    15,729.12 : 21,680.98 = 11,939.96 : x
  2. Step 2: Convert to fraction form
    15,729.12/21,680.98 = 11,939.96/x
  3. Step 3: Cross multiply
    15,729.12x = 21,680.98 × 11,939.96
  4. Step 4: Simplify right side
    15,729.12x = 258,870,033.96
  5. Step 5: Solve for x
    x = 258,870,033.96/15,729.12
  6. Step 6: Final answer
    x = 16,458.01

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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.