Home / 20,796.96-31,140-13,360.80

Finding the Fourth Proportional to 20,796.96, 31,140 and 13,360.80

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Solution

The fourth proportional to 20,796.96, 31,140 and 13,360.80 is: 20,005.58

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,796.96 : 31,140 = 13,360.80 : x
  2. Step 2: Convert to fraction form
    20,796.96/31,140 = 13,360.80/x
  3. Step 3: Cross multiply
    20,796.96x = 31,140 × 13,360.80
  4. Step 4: Simplify right side
    20,796.96x = 416,055,312
  5. Step 5: Solve for x
    x = 416,055,312/20,796.96
  6. Step 6: Final answer
    x = 20,005.58

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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.