Home / 20,815.12-28,716.42-11,860.96

Finding the Fourth Proportional to 20,815.12, 28,716.42 and 11,860.96

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Solution

The fourth proportional to 20,815.12, 28,716.42 and 11,860.96 is: 16,363.31

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,815.12 : 28,716.42 = 11,860.96 : x
  2. Step 2: Convert to fraction form
    20,815.12/28,716.42 = 11,860.96/x
  3. Step 3: Cross multiply
    20,815.12x = 28,716.42 × 11,860.96
  4. Step 4: Simplify right side
    20,815.12x = 340,604,308.96
  5. Step 5: Solve for x
    x = 340,604,308.96/20,815.12
  6. Step 6: Final answer
    x = 16,363.31

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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.