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Finding the Fourth Proportional to 18,917.22, 28,296.81 and 13,294.48

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Solution

The fourth proportional to 18,917.22, 28,296.81 and 13,294.48 is: 19,886.19

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,917.22 : 28,296.81 = 13,294.48 : x
  2. Step 2: Convert to fraction form
    18,917.22/28,296.81 = 13,294.48/x
  3. Step 3: Cross multiply
    18,917.22x = 28,296.81 × 13,294.48
  4. Step 4: Simplify right side
    18,917.22x = 376,191,374.61
  5. Step 5: Solve for x
    x = 376,191,374.61/18,917.22
  6. Step 6: Final answer
    x = 19,886.19

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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.