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Finding the Fourth Proportional to 28,687.80, 43,015.14 and 11,137.14

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Solution

The fourth proportional to 28,687.80, 43,015.14 and 11,137.14 is: 16,699.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    28,687.80 : 43,015.14 = 11,137.14 : x
  2. Step 2: Convert to fraction form
    28,687.80/43,015.14 = 11,137.14/x
  3. Step 3: Cross multiply
    28,687.80x = 43,015.14 × 11,137.14
  4. Step 4: Simplify right side
    28,687.80x = 479,065,636.30
  5. Step 5: Solve for x
    x = 479,065,636.30/28,687.80
  6. Step 6: Final answer
    x = 16,699.28

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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.