Home / 21,971.09-30,319.92-11,899.49

Finding the Fourth Proportional to 21,971.09, 30,319.92 and 11,899.49

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Solution

The fourth proportional to 21,971.09, 30,319.92 and 11,899.49 is: 16,421.20

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,971.09 : 30,319.92 = 11,899.49 : x
  2. Step 2: Convert to fraction form
    21,971.09/30,319.92 = 11,899.49/x
  3. Step 3: Cross multiply
    21,971.09x = 30,319.92 × 11,899.49
  4. Step 4: Simplify right side
    21,971.09x = 360,791,584.84
  5. Step 5: Solve for x
    x = 360,791,584.84/21,971.09
  6. Step 6: Final answer
    x = 16,421.20

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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.