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Finding the Fourth Proportional to 18,919.88, 28,386.30 and 7,236.44

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Solution

The fourth proportional to 18,919.88, 28,386.30 and 7,236.44 is: 10,857.14

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,919.88 : 28,386.30 = 7,236.44 : x
  2. Step 2: Convert to fraction form
    18,919.88/28,386.30 = 7,236.44/x
  3. Step 3: Cross multiply
    18,919.88x = 28,386.30 × 7,236.44
  4. Step 4: Simplify right side
    18,919.88x = 205,415,756.77
  5. Step 5: Solve for x
    x = 205,415,756.77/18,919.88
  6. Step 6: Final answer
    x = 10,857.14

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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.