Home / 20,813.22-28,718.51-12,311.11

Finding the Fourth Proportional to 20,813.22, 28,718.51 and 12,311.11

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Solution

The fourth proportional to 20,813.22, 28,718.51 and 12,311.11 is: 16,987.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,813.22 : 28,718.51 = 12,311.11 : x
  2. Step 2: Convert to fraction form
    20,813.22/28,718.51 = 12,311.11/x
  3. Step 3: Cross multiply
    20,813.22x = 28,718.51 × 12,311.11
  4. Step 4: Simplify right side
    20,813.22x = 353,556,735.65
  5. Step 5: Solve for x
    x = 353,556,735.65/20,813.22
  6. Step 6: Final answer
    x = 16,987.12

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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.