Home / 21,218.11-31,811.45-10,680.42

Finding the Fourth Proportional to 21,218.11, 31,811.45 and 10,680.42

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Solution

The fourth proportional to 21,218.11, 31,811.45 and 10,680.42 is: 16,012.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,218.11 : 31,811.45 = 10,680.42 : x
  2. Step 2: Convert to fraction form
    21,218.11/31,811.45 = 10,680.42/x
  3. Step 3: Cross multiply
    21,218.11x = 31,811.45 × 10,680.42
  4. Step 4: Simplify right side
    21,218.11x = 339,759,593.84
  5. Step 5: Solve for x
    x = 339,759,593.84/21,218.11
  6. Step 6: Final answer
    x = 16,012.71

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.