Home / 20,860.84-28,786.89-11,429.20

Finding the Fourth Proportional to 20,860.84, 28,786.89 and 11,429.20

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Solution

The fourth proportional to 20,860.84, 28,786.89 and 11,429.20 is: 15,771.71

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,860.84 : 28,786.89 = 11,429.20 : x
  2. Step 2: Convert to fraction form
    20,860.84/28,786.89 = 11,429.20/x
  3. Step 3: Cross multiply
    20,860.84x = 28,786.89 × 11,429.20
  4. Step 4: Simplify right side
    20,860.84x = 329,011,123.19
  5. Step 5: Solve for x
    x = 329,011,123.19/20,860.84
  6. Step 6: Final answer
    x = 15,771.71

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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.