Home / 20,999.13-31,499.30-5,416.75

Finding the Fourth Proportional to 20,999.13, 31,499.30 and 5,416.75

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Solution

The fourth proportional to 20,999.13, 31,499.30 and 5,416.75 is: 8,125.28

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,999.13 : 31,499.30 = 5,416.75 : x
  2. Step 2: Convert to fraction form
    20,999.13/31,499.30 = 5,416.75/x
  3. Step 3: Cross multiply
    20,999.13x = 31,499.30 × 5,416.75
  4. Step 4: Simplify right side
    20,999.13x = 170,623,833.28
  5. Step 5: Solve for x
    x = 170,623,833.28/20,999.13
  6. Step 6: Final answer
    x = 8,125.28

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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.