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Finding the Fourth Proportional to 18,964.80, 28,436.16 and 12,732.16

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Solution

The fourth proportional to 18,964.80, 28,436.16 and 12,732.16 is: 19,090.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,964.80 : 28,436.16 = 12,732.16 : x
  2. Step 2: Convert to fraction form
    18,964.80/28,436.16 = 12,732.16/x
  3. Step 3: Cross multiply
    18,964.80x = 28,436.16 × 12,732.16
  4. Step 4: Simplify right side
    18,964.80x = 362,053,738.91
  5. Step 5: Solve for x
    x = 362,053,738.91/18,964.80
  6. Step 6: Final answer
    x = 19,090.83

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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.