Home / 20,813.51-28,723.42-11,860.78

Finding the Fourth Proportional to 20,813.51, 28,723.42 and 11,860.78

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Solution

The fourth proportional to 20,813.51, 28,723.42 and 11,860.78 is: 16,368.32

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,813.51 : 28,723.42 = 11,860.78 : x
  2. Step 2: Convert to fraction form
    20,813.51/28,723.42 = 11,860.78/x
  3. Step 3: Cross multiply
    20,813.51x = 28,723.42 × 11,860.78
  4. Step 4: Simplify right side
    20,813.51x = 340,682,165.47
  5. Step 5: Solve for x
    x = 340,682,165.47/20,813.51
  6. Step 6: Final answer
    x = 16,368.32

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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.