Home / 21,270.67-31,910.62-6,479.20

Finding the Fourth Proportional to 21,270.67, 31,910.62 and 6,479.20

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Solution

The fourth proportional to 21,270.67, 31,910.62 and 6,479.20 is: 9,720.21

Step by Step Solution

  1. Step 1: Write the proportion equation
    21,270.67 : 31,910.62 = 6,479.20 : x
  2. Step 2: Convert to fraction form
    21,270.67/31,910.62 = 6,479.20/x
  3. Step 3: Cross multiply
    21,270.67x = 31,910.62 × 6,479.20
  4. Step 4: Simplify right side
    21,270.67x = 206,755,289.10
  5. Step 5: Solve for x
    x = 206,755,289.10/21,270.67
  6. Step 6: Final answer
    x = 9,720.21

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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.