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Finding the Fourth Proportional to 18,372.21, 25,353.62 and 10,920.21

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Solution

The fourth proportional to 18,372.21, 25,353.62 and 10,920.21 is: 15,069.87

Step by Step Solution

  1. Step 1: Write the proportion equation
    18,372.21 : 25,353.62 = 10,920.21 : x
  2. Step 2: Convert to fraction form
    18,372.21/25,353.62 = 10,920.21/x
  3. Step 3: Cross multiply
    18,372.21x = 25,353.62 × 10,920.21
  4. Step 4: Simplify right side
    18,372.21x = 276,866,800.06
  5. Step 5: Solve for x
    x = 276,866,800.06/18,372.21
  6. Step 6: Final answer
    x = 15,069.87

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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.