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Finding the Fourth Proportional to 74,124, 111,186 and 18,720

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Solution

The fourth proportional to 74,124, 111,186 and 18,720 is: 28,080

Step by Step Solution

  1. Step 1: Write the proportion equation
    74,124 : 111,186 = 18,720 : x
  2. Step 2: Convert to fraction form
    74,124/111,186 = 18,720/x
  3. Step 3: Cross multiply
    74,124x = 111,186 × 18,720
  4. Step 4: Simplify right side
    74,124x = 2,081,401,920
  5. Step 5: Solve for x
    x = 2,081,401,920/74,124
  6. Step 6: Final answer
    x = 28,080

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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.