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Finding the Fourth Proportional to 13,347.28, 18,420.11 and 7,379

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Solution

The fourth proportional to 13,347.28, 18,420.11 and 7,379 is: 10,183.50

Step by Step Solution

  1. Step 1: Write the proportion equation
    13,347.28 : 18,420.11 = 7,379 : x
  2. Step 2: Convert to fraction form
    13,347.28/18,420.11 = 7,379/x
  3. Step 3: Cross multiply
    13,347.28x = 18,420.11 × 7,379
  4. Step 4: Simplify right side
    13,347.28x = 135,921,991.69
  5. Step 5: Solve for x
    x = 135,921,991.69/13,347.28
  6. Step 6: Final answer
    x = 10,183.50

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1.5x scale

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.