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Finding the Fourth Proportional to 20,992.53, 28,964.72 and 11,915.88

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Solution

The fourth proportional to 20,992.53, 28,964.72 and 11,915.88 is: 16,441.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.53 : 28,964.72 = 11,915.88 : x
  2. Step 2: Convert to fraction form
    20,992.53/28,964.72 = 11,915.88/x
  3. Step 3: Cross multiply
    20,992.53x = 28,964.72 × 11,915.88
  4. Step 4: Simplify right side
    20,992.53x = 345,140,048.93
  5. Step 5: Solve for x
    x = 345,140,048.93/20,992.53
  6. Step 6: Final answer
    x = 16,441.09

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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.