Home / 20,820.12-31,208.31-7,664.10

Finding the Fourth Proportional to 20,820.12, 31,208.31 and 7,664.10

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Solution

The fourth proportional to 20,820.12, 31,208.31 and 7,664.10 is: 11,488.10

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,820.12 : 31,208.31 = 7,664.10 : x
  2. Step 2: Convert to fraction form
    20,820.12/31,208.31 = 7,664.10/x
  3. Step 3: Cross multiply
    20,820.12x = 31,208.31 × 7,664.10
  4. Step 4: Simplify right side
    20,820.12x = 239,183,608.67
  5. Step 5: Solve for x
    x = 239,183,608.67/20,820.12
  6. Step 6: Final answer
    x = 11,488.10

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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.