Home / 20,666.62-28,519.31-12,166.78

Finding the Fourth Proportional to 20,666.62, 28,519.31 and 12,166.78

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Solution

The fourth proportional to 20,666.62, 28,519.31 and 12,166.78 is: 16,789.79

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,666.62 : 28,519.31 = 12,166.78 : x
  2. Step 2: Convert to fraction form
    20,666.62/28,519.31 = 12,166.78/x
  3. Step 3: Cross multiply
    20,666.62x = 28,519.31 × 12,166.78
  4. Step 4: Simplify right side
    20,666.62x = 346,988,109.69
  5. Step 5: Solve for x
    x = 346,988,109.69/20,666.62
  6. Step 6: Final answer
    x = 16,789.79

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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.