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Finding the Fourth Proportional to 19,687.80, 29,553.30 and 12,300.60

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Solution

The fourth proportional to 19,687.80, 29,553.30 and 12,300.60 is: 18,464.40

Step by Step Solution

  1. Step 1: Write the proportion equation
    19,687.80 : 29,553.30 = 12,300.60 : x
  2. Step 2: Convert to fraction form
    19,687.80/29,553.30 = 12,300.60/x
  3. Step 3: Cross multiply
    19,687.80x = 29,553.30 × 12,300.60
  4. Step 4: Simplify right side
    19,687.80x = 363,523,321.98
  5. Step 5: Solve for x
    x = 363,523,321.98/19,687.80
  6. Step 6: Final answer
    x = 18,464.40

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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.