Home / 17,139.20-25,660.20-13,218.80

Finding the Fourth Proportional to 17,139.20, 25,660.20 and 13,218.80

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Solution

The fourth proportional to 17,139.20, 25,660.20 and 13,218.80 is: 19,790.72

Step by Step Solution

  1. Step 1: Write the proportion equation
    17,139.20 : 25,660.20 = 13,218.80 : x
  2. Step 2: Convert to fraction form
    17,139.20/25,660.20 = 13,218.80/x
  3. Step 3: Cross multiply
    17,139.20x = 25,660.20 × 13,218.80
  4. Step 4: Simplify right side
    17,139.20x = 339,197,051.76
  5. Step 5: Solve for x
    x = 339,197,051.76/17,139.20
  6. Step 6: Final answer
    x = 19,790.72

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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.