Home / 21,958.61-30,301.80-12,399.59

Finding the Fourth Proportional to 21,958.61, 30,301.80 and 12,399.59

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Solution

The fourth proportional to 21,958.61, 30,301.80 and 12,399.59 is: 17,110.82

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,958.61 : 30,301.80 = 12,399.59 : x
  2. Step 2: Convert to fraction form
    21,958.61/30,301.80 = 12,399.59/x
  3. Step 3: Cross multiply
    21,958.61x = 30,301.80 × 12,399.59
  4. Step 4: Simplify right side
    21,958.61x = 375,729,744.75
  5. Step 5: Solve for x
    x = 375,729,744.75/21,958.61
  6. Step 6: Final answer
    x = 17,110.82

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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.