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Finding the Fourth Proportional to 18,420.84, 27,631.52 and 5,273.22

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Solution

The fourth proportional to 18,420.84, 27,631.52 and 5,273.22 is: 7,909.90

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,420.84 : 27,631.52 = 5,273.22 : x
  2. Step 2: Convert to fraction form
    18,420.84/27,631.52 = 5,273.22/x
  3. Step 3: Cross multiply
    18,420.84x = 27,631.52 × 5,273.22
  4. Step 4: Simplify right side
    18,420.84x = 145,707,083.89
  5. Step 5: Solve for x
    x = 145,707,083.89/18,420.84
  6. Step 6: Final answer
    x = 7,909.90

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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.