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Finding the Fourth Proportional to 13,621, 20,431.50 and 4,387

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Solution

The fourth proportional to 13,621, 20,431.50 and 4,387 is: 6,580.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,621 : 20,431.50 = 4,387 : x
  2. Step 2: Convert to fraction form
    13,621/20,431.50 = 4,387/x
  3. Step 3: Cross multiply
    13,621x = 20,431.50 × 4,387
  4. Step 4: Simplify right side
    13,621x = 89,632,990.50
  5. Step 5: Solve for x
    x = 89,632,990.50/13,621
  6. Step 6: Final answer
    x = 6,580.50

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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.