Home / 20,810.22-31,200.72-7,660.90

Finding the Fourth Proportional to 20,810.22, 31,200.72 and 7,660.90

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Solution

The fourth proportional to 20,810.22, 31,200.72 and 7,660.90 is: 11,485.97

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,810.22 : 31,200.72 = 7,660.90 : x
  2. Step 2: Convert to fraction form
    20,810.22/31,200.72 = 7,660.90/x
  3. Step 3: Cross multiply
    20,810.22x = 31,200.72 × 7,660.90
  4. Step 4: Simplify right side
    20,810.22x = 239,025,595.85
  5. Step 5: Solve for x
    x = 239,025,595.85/20,810.22
  6. Step 6: Final answer
    x = 11,485.97

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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.