Home / 20,813.16-28,717.90-12,311.08

Finding the Fourth Proportional to 20,813.16, 28,717.90 and 12,311.08

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Solution

The fourth proportional to 20,813.16, 28,717.90 and 12,311.08 is: 16,986.77

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,813.16 : 28,717.90 = 12,311.08 : x
  2. Step 2: Convert to fraction form
    20,813.16/28,717.90 = 12,311.08/x
  3. Step 3: Cross multiply
    20,813.16x = 28,717.90 × 12,311.08
  4. Step 4: Simplify right side
    20,813.16x = 353,548,364.33
  5. Step 5: Solve for x
    x = 353,548,364.33/20,813.16
  6. Step 6: Final answer
    x = 16,986.77

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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.