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Finding the Fourth Proportional to 18,918.22, 28,298.31 and 13,295.48

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Solution

The fourth proportional to 18,918.22, 28,298.31 and 13,295.48 is: 19,887.69

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,918.22 : 28,298.31 = 13,295.48 : x
  2. Step 2: Convert to fraction form
    18,918.22/28,298.31 = 13,295.48/x
  3. Step 3: Cross multiply
    18,918.22x = 28,298.31 × 13,295.48
  4. Step 4: Simplify right side
    18,918.22x = 376,239,614.64
  5. Step 5: Solve for x
    x = 376,239,614.64/18,918.22
  6. Step 6: Final answer
    x = 19,887.69

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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.