Home / 20,680.86-31,003.74-8,209.65

Finding the Fourth Proportional to 20,680.86, 31,003.74 and 8,209.65

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Solution

The fourth proportional to 20,680.86, 31,003.74 and 8,209.65 is: 12,307.51

Step by Step Solution

  1. Step 1: Write the proportion equation
    20,680.86 : 31,003.74 = 8,209.65 : x
  2. Step 2: Convert to fraction form
    20,680.86/31,003.74 = 8,209.65/x
  3. Step 3: Cross multiply
    20,680.86x = 31,003.74 × 8,209.65
  4. Step 4: Simplify right side
    20,680.86x = 254,529,854.09
  5. Step 5: Solve for x
    x = 254,529,854.09/20,680.86
  6. Step 6: Final answer
    x = 12,307.51

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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.