Home / 10,815.36-16,221.68-3,420.56

Finding the Fourth Proportional to 10,815.36, 16,221.68 and 3,420.56

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Solution

The fourth proportional to 10,815.36, 16,221.68 and 3,420.56 is: 5,130.41

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,815.36 : 16,221.68 = 3,420.56 : x
  2. Step 2: Convert to fraction form
    10,815.36/16,221.68 = 3,420.56/x
  3. Step 3: Cross multiply
    10,815.36x = 16,221.68 × 3,420.56
  4. Step 4: Simplify right side
    10,815.36x = 55,487,229.74
  5. Step 5: Solve for x
    x = 55,487,229.74/10,815.36
  6. Step 6: Final answer
    x = 5,130.41

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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.