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Finding the Fourth Proportional to 13,995.14, 20,964.80 and 8,431.70

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Solution

The fourth proportional to 13,995.14, 20,964.80 and 8,431.70 is: 12,630.73

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,995.14 : 20,964.80 = 8,431.70 : x
  2. Step 2: Convert to fraction form
    13,995.14/20,964.80 = 8,431.70/x
  3. Step 3: Cross multiply
    13,995.14x = 20,964.80 × 8,431.70
  4. Step 4: Simplify right side
    13,995.14x = 176,768,904.16
  5. Step 5: Solve for x
    x = 176,768,904.16/13,995.14
  6. Step 6: Final answer
    x = 12,630.73

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.50) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.