Home / 20,997-28,975.95-11,565.36

Finding the Fourth Proportional to 20,997, 28,975.95 and 11,565.36

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Solution

The fourth proportional to 20,997, 28,975.95 and 11,565.36 is: 15,960.25

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,997 : 28,975.95 = 11,565.36 : x
  2. Step 2: Convert to fraction form
    20,997/28,975.95 = 11,565.36/x
  3. Step 3: Cross multiply
    20,997x = 28,975.95 × 11,565.36
  4. Step 4: Simplify right side
    20,997x = 335,117,293.09
  5. Step 5: Solve for x
    x = 335,117,293.09/20,997
  6. Step 6: Final answer
    x = 15,960.25

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.