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Finding the Fourth Proportional to 19,693.80, 27,192.96 and 12,143.88

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Solution

The fourth proportional to 19,693.80, 27,192.96 and 12,143.88 is: 16,768.12

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,693.80 : 27,192.96 = 12,143.88 : x
  2. Step 2: Convert to fraction form
    19,693.80/27,192.96 = 12,143.88/x
  3. Step 3: Cross multiply
    19,693.80x = 27,192.96 × 12,143.88
  4. Step 4: Simplify right side
    19,693.80x = 330,228,043.08
  5. Step 5: Solve for x
    x = 330,228,043.08/19,693.80
  6. Step 6: Final answer
    x = 16,768.12

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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.