Home / 20,992.40-28,964.55-11,915.75

Finding the Fourth Proportional to 20,992.40, 28,964.55 and 11,915.75

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Solution

The fourth proportional to 20,992.40, 28,964.55 and 11,915.75 is: 16,440.92

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.40 : 28,964.55 = 11,915.75 : x
  2. Step 2: Convert to fraction form
    20,992.40/28,964.55 = 11,915.75/x
  3. Step 3: Cross multiply
    20,992.40x = 28,964.55 × 11,915.75
  4. Step 4: Simplify right side
    20,992.40x = 345,134,336.66
  5. Step 5: Solve for x
    x = 345,134,336.66/20,992.40
  6. Step 6: Final answer
    x = 16,440.92

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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.