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Finding the Fourth Proportional to 12,687.98, 19,020.63 and 9,899.42

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Solution

The fourth proportional to 12,687.98, 19,020.63 and 9,899.42 is: 14,840.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    12,687.98 : 19,020.63 = 9,899.42 : x
  2. Step 2: Convert to fraction form
    12,687.98/19,020.63 = 9,899.42/x
  3. Step 3: Cross multiply
    12,687.98x = 19,020.63 × 9,899.42
  4. Step 4: Simplify right side
    12,687.98x = 188,293,205.03
  5. Step 5: Solve for x
    x = 188,293,205.03/12,687.98
  6. Step 6: Final answer
    x = 14,840.28

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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.