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Finding the Fourth Proportional to 18,954.78, 28,420.01 and 7,869.12

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Solution

The fourth proportional to 18,954.78, 28,420.01 and 7,869.12 is: 11,798.63

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,954.78 : 28,420.01 = 7,869.12 : x
  2. Step 2: Convert to fraction form
    18,954.78/28,420.01 = 7,869.12/x
  3. Step 3: Cross multiply
    18,954.78x = 28,420.01 × 7,869.12
  4. Step 4: Simplify right side
    18,954.78x = 223,640,429.75
  5. Step 5: Solve for x
    x = 223,640,429.75/18,954.78
  6. Step 6: Final answer
    x = 11,798.63

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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.