Home / 20,711.81-28,585.11-12,216.33

Finding the Fourth Proportional to 20,711.81, 28,585.11 and 12,216.33

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Solution

The fourth proportional to 20,711.81, 28,585.11 and 12,216.33 is: 16,860.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,711.81 : 28,585.11 = 12,216.33 : x
  2. Step 2: Convert to fraction form
    20,711.81/28,585.11 = 12,216.33/x
  3. Step 3: Cross multiply
    20,711.81x = 28,585.11 × 12,216.33
  4. Step 4: Simplify right side
    20,711.81x = 349,205,136.85
  5. Step 5: Solve for x
    x = 349,205,136.85/20,711.81
  6. Step 6: Final answer
    x = 16,860.19

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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.