Home / 21,910.12-30,231.78-13,529.32

Finding the Fourth Proportional to 21,910.12, 30,231.78 and 13,529.32

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Solution

The fourth proportional to 21,910.12, 30,231.78 and 13,529.32 is: 18,667.88

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,910.12 : 30,231.78 = 13,529.32 : x
  2. Step 2: Convert to fraction form
    21,910.12/30,231.78 = 13,529.32/x
  3. Step 3: Cross multiply
    21,910.12x = 30,231.78 × 13,529.32
  4. Step 4: Simplify right side
    21,910.12x = 409,015,425.79
  5. Step 5: Solve for x
    x = 409,015,425.79/21,910.12
  6. Step 6: Final answer
    x = 18,667.88

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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.