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Finding the Fourth Proportional to 18,978.12, 26,190 and 11,017.44

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Solution

The fourth proportional to 18,978.12, 26,190 and 11,017.44 is: 15,204.18

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,978.12 : 26,190 = 11,017.44 : x
  2. Step 2: Convert to fraction form
    18,978.12/26,190 = 11,017.44/x
  3. Step 3: Cross multiply
    18,978.12x = 26,190 × 11,017.44
  4. Step 4: Simplify right side
    18,978.12x = 288,546,753.60
  5. Step 5: Solve for x
    x = 288,546,753.60/18,978.12
  6. Step 6: Final answer
    x = 15,204.18

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.