Home / 20,992.13-31,490.01-5,409.75

Finding the Fourth Proportional to 20,992.13, 31,490.01 and 5,409.75

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Solution

The fourth proportional to 20,992.13, 31,490.01 and 5,409.75 is: 8,115.09

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,992.13 : 31,490.01 = 5,409.75 : x
  2. Step 2: Convert to fraction form
    20,992.13/31,490.01 = 5,409.75/x
  3. Step 3: Cross multiply
    20,992.13x = 31,490.01 × 5,409.75
  4. Step 4: Simplify right side
    20,992.13x = 170,353,081.60
  5. Step 5: Solve for x
    x = 170,353,081.60/20,992.13
  6. Step 6: Final answer
    x = 8,115.09

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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.