Home / 20,860.13-28,786.79-11,428.70

Finding the Fourth Proportional to 20,860.13, 28,786.79 and 11,428.70

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Solution

The fourth proportional to 20,860.13, 28,786.79 and 11,428.70 is: 15,771.49

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.13 : 28,786.79 = 11,428.70 : x
  2. Step 2: Convert to fraction form
    20,860.13/28,786.79 = 11,428.70/x
  3. Step 3: Cross multiply
    20,860.13x = 28,786.79 × 11,428.70
  4. Step 4: Simplify right side
    20,860.13x = 328,995,471.51
  5. Step 5: Solve for x
    x = 328,995,471.51/20,860.13
  6. Step 6: Final answer
    x = 15,771.49

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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.