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Finding the Fourth Proportional to 18,520.80, 27,771.12 and 12,684

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Solution

The fourth proportional to 18,520.80, 27,771.12 and 12,684 is: 19,019.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,520.80 : 27,771.12 = 12,684 : x
  2. Step 2: Convert to fraction form
    18,520.80/27,771.12 = 12,684/x
  3. Step 3: Cross multiply
    18,520.80x = 27,771.12 × 12,684
  4. Step 4: Simplify right side
    18,520.80x = 352,248,886.08
  5. Step 5: Solve for x
    x = 352,248,886.08/18,520.80
  6. Step 6: Final answer
    x = 19,019.10

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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.