Home / 21,918.25-30,247.19-12,486.81

Finding the Fourth Proportional to 21,918.25, 30,247.19 and 12,486.81

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Solution

The fourth proportional to 21,918.25, 30,247.19 and 12,486.81 is: 17,231.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,918.25 : 30,247.19 = 12,486.81 : x
  2. Step 2: Convert to fraction form
    21,918.25/30,247.19 = 12,486.81/x
  3. Step 3: Cross multiply
    21,918.25x = 30,247.19 × 12,486.81
  4. Step 4: Simplify right side
    21,918.25x = 377,690,914.56
  5. Step 5: Solve for x
    x = 377,690,914.56/21,918.25
  6. Step 6: Final answer
    x = 17,231.80

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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.