Home / 10,815.30-16,220.61-3,420.36

Finding the Fourth Proportional to 10,815.30, 16,220.61 and 3,420.36

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Solution

The fourth proportional to 10,815.30, 16,220.61 and 3,420.36 is: 5,129.80

Step by Step Solution

  1. Step 1: Write the proportion equation
    10,815.30 : 16,220.61 = 3,420.36 : x
  2. Step 2: Convert to fraction form
    10,815.30/16,220.61 = 3,420.36/x
  3. Step 3: Cross multiply
    10,815.30x = 16,220.61 × 3,420.36
  4. Step 4: Simplify right side
    10,815.30x = 55,480,325.62
  5. Step 5: Solve for x
    x = 55,480,325.62/10,815.30
  6. Step 6: Final answer
    x = 5,129.80

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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.