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Finding the Fourth Proportional to 18,930.51, 28,401 and 16,864.80

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Solution

The fourth proportional to 18,930.51, 28,401 and 16,864.80 is: 25,301.86

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,930.51 : 28,401 = 16,864.80 : x
  2. Step 2: Convert to fraction form
    18,930.51/28,401 = 16,864.80/x
  3. Step 3: Cross multiply
    18,930.51x = 28,401 × 16,864.80
  4. Step 4: Simplify right side
    18,930.51x = 478,977,184.80
  5. Step 5: Solve for x
    x = 478,977,184.80/18,930.51
  6. Step 6: Final answer
    x = 25,301.86

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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.