Home / 20,917.86-31,376.25-5,122.86

Finding the Fourth Proportional to 20,917.86, 31,376.25 and 5,122.86

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Solution

The fourth proportional to 20,917.86, 31,376.25 and 5,122.86 is: 7,684.16

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,917.86 : 31,376.25 = 5,122.86 : x
  2. Step 2: Convert to fraction form
    20,917.86/31,376.25 = 5,122.86/x
  3. Step 3: Cross multiply
    20,917.86x = 31,376.25 × 5,122.86
  4. Step 4: Simplify right side
    20,917.86x = 160,736,136.08
  5. Step 5: Solve for x
    x = 160,736,136.08/20,917.86
  6. Step 6: Final answer
    x = 7,684.16

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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.